[NTP Client][Reland]Use the separate button style for the NoArticles status

Original issue's description:
> [NTP Client] Use the separate button style for the NoArticles status
>
> Makes the articles and bookmarks sections use the same style of status
> card when they have no snippets.
>
> the hasMoreButton property of categories now only determines whether
> the action item will be shown when there are suggestions to display.
>
> This patch also lets the SuggestionsCategoryInfo be aware of the
> current category it is describing, and moves various category specific
> behaviours into the SuggestionsCategoryInfo class.
>
> Preview: https://goo.gl/photos/VhceT6cjvME6QS8m7
>
> BUG=649670
>
> Committed: https://crrev.com/ffa8e3905fed0b1df0d56ab6e4b17791b31cd171
> Cr-Commit-Position: refs/heads/master@{#423517}

> Revert Data:
> Committed: https://crrev.com/b5e8956c2c8a10484d10a117b3ef5a33ee58cb6c
> Cr-Commit-Position: refs/heads/master@{#423573}

BUG=649670

Review-Url: https://codereview.chromium.org/2401643004
Cr-Commit-Position: refs/heads/master@{#423863}

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/ActionItem.java

@@ -6,11 +6,9 @@ package org.chromium.chrome.browser.ntp.cards;
 
 import android.view.View;
 
-import org.chromium.base.Log;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ntp.NewTabPageView.NewTabPageManager;
 import org.chromium.chrome.browser.ntp.UiConfig;
-import org.chromium.chrome.browser.ntp.snippets.KnownCategories;
 
 /**
  * Item that allows the user to perform an action on the NTP.
@@ -18,15 +16,15 @@ import org.chromium.chrome.browser.ntp.snippets.KnownCategories;
 class ActionItem implements NewTabPageItem {
     private static final String TAG = "NtpCards";
 
-    private final int mCategory;
+    private final SuggestionsCategoryInfo mCategoryInfo;
 
     // The position (index) of this item within its section, for logging purposes.
     private int mPosition;
     private boolean mImpressionTracked = false;
     private boolean mDismissable;
 
-    public ActionItem(int category) {
-        mCategory = category;
+    public ActionItem(SuggestionsCategoryInfo categoryInfo) {
+        mCategoryInfo = categoryInfo;
     }
 
     @Override
@@ -45,31 +43,19 @@ class ActionItem implements NewTabPageItem {
     public static class ViewHolder extends CardViewHolder {
         private ActionItem mActionListItem;
 
-
-        public ViewHolder(NewTabPageRecyclerView recyclerView, final NewTabPageManager manager,
-                UiConfig uiConfig) {
+        public ViewHolder(final NewTabPageRecyclerView recyclerView,
+                final NewTabPageManager manager, UiConfig uiConfig) {
             super(R.layout.new_tab_page_action_card, recyclerView, uiConfig);
 
             itemView.findViewById(R.id.action_button)
                     .setOnClickListener(new View.OnClickListener() {
                         @Override
                         public void onClick(View v) {
-                            int category = mActionListItem.mCategory;
+                            int category = mActionListItem.mCategoryInfo.getCategory();
                             manager.trackSnippetCategoryActionClick(
                                     category, mActionListItem.mPosition);
-                            if (category == KnownCategories.BOOKMARKS) {
-                                manager.navigateToBookmarks();
-                            } else if (category == KnownCategories.DOWNLOADS) {
-                                manager.navigateToDownloadManager();
-                            } else if (category == KnownCategories.FOREIGN_TABS) {
-                                manager.navigateToRecentTabs();
-                            } else {
-                                // TODO(pke): This should redirect to the C++ backend. Once it does,
-                                // change the condition in the SuggestionsSection constructor.
-                                Log.wtf(TAG,
-                                        "More action called on a dynamically added section: %d",
-                                        category);
-                            }
+                            mActionListItem.mCategoryInfo.performEmptyStateAction(
+                                    manager, recyclerView.getNewTabPageAdapter());
                         }
                     });
 
@@ -79,7 +65,8 @@ class ActionItem implements NewTabPageItem {
                     if (mActionListItem != null && !mActionListItem.mImpressionTracked) {
                         mActionListItem.mImpressionTracked = true;
                         manager.trackSnippetCategoryActionImpression(
-                                mActionListItem.mCategory, mActionListItem.mPosition);
+                                mActionListItem.mCategoryInfo.getCategory(),
+                                mActionListItem.mPosition);
                     }
                 }
             });

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java

@@ -211,7 +211,7 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder>
 
         SuggestionsSection section = mSections.get(category);
         if (section == null) {
-            section = new SuggestionsSection(category, info, this);
+            section = new SuggestionsSection(info, this);
             mSections.put(category, section);
         }
 

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/StatusItem.java

@@ -5,118 +5,33 @@
 package org.chromium.chrome.browser.ntp.cards;
 
 import android.content.Context;
-import android.support.annotation.Nullable;
 
-import org.chromium.base.Log;
 import org.chromium.chrome.R;
-import org.chromium.chrome.browser.ntp.snippets.CategoryStatus;
-import org.chromium.chrome.browser.ntp.snippets.CategoryStatus.CategoryStatusEnum;
 
 /**
  * Card that is shown when the user needs to be made aware of some information about their
- * configuration about the NTP suggestions: there is no more available suggested content, sync
- * should be enabled, etc.
+ * configuration that affects the NTP suggestions.
  */
-public abstract class StatusItem implements NewTabPageItem {
-    /**
-     * Delegate to provide the status cards a way to interact with the rest of the system: tap
-     * handler, etc.
-     */
-    public interface ActionDelegate { void onButtonTapped(); }
-
-    private static class NoBookmarks extends StatusItem {
-        public NoBookmarks() {
-            super(R.string.ntp_status_card_title_no_bookmarks,
-                    R.string.ntp_status_card_no_bookmarks, 0);
-            Log.d(TAG, "Registering card for status: No Bookmarks");
-        }
-
-        @Override
-        protected void performAction(Context context) {
-            assert false; // not reached.
-        }
-
-        @Override
-        protected boolean hasAction() {
-            return false;
-        }
-    }
-
-    private static class NoSnippets extends StatusItem {
-        private final ActionDelegate mActionDelegate;
-
-        public NoSnippets(ActionDelegate actionDelegate) {
-            super(R.string.ntp_status_card_title_no_articles, R.string.ntp_status_card_no_articles,
-                    R.string.reload);
-            mActionDelegate = actionDelegate;
-            Log.d(TAG, "Registering card for status: No Snippets");
-        }
-
-        @Override
-        protected void performAction(Context context) {
-            mActionDelegate.onButtonTapped();
-        }
-    }
-
-    private static final String TAG = "NtpCards";
-
+public class StatusItem implements NewTabPageItem {
     private final int mHeaderStringId;
     private final int mDescriptionStringId;
     private final int mActionStringId;
 
-    public static StatusItem create(
-            @CategoryStatusEnum int categoryStatus, @Nullable ActionDelegate actionDelegate) {
-        switch (categoryStatus) {
-            case CategoryStatus.SIGNED_OUT:
-            // Fall through. Sign out is a transitive state that we just use to clear content.
-            case CategoryStatus.AVAILABLE:
-            case CategoryStatus.AVAILABLE_LOADING:
-            case CategoryStatus.INITIALIZING:
-                // TODO(dgn): rewrite this whole thing? Get one card and change its state instead
-                // of recreating it. It would be more flexible in terms of adapting the content
-                // to different usages.
-                return actionDelegate == null ? new NoBookmarks() : new NoSnippets(actionDelegate);
-
-            case CategoryStatus.ALL_SUGGESTIONS_EXPLICITLY_DISABLED:
-                Log.wtf(TAG, "Attempted to create a status card while the feature should be off.");
-                return null;
-
-            case CategoryStatus.CATEGORY_EXPLICITLY_DISABLED:
-                // In this case, the entire section should have been cleared off the UI.
-                Log.wtf(TAG, "Attempted to create a status card for content suggestions "
-                                + " when the category status is CATEGORY_EXPLICITLY_DISABLED.");
-                return null;
-
-            case CategoryStatus.NOT_PROVIDED:
-                // In this case, the UI should remain as it is and also keep the previous category
-                // status, so the NOT_PROVIDED should never reach here.
-                Log.wtf(TAG, "Attempted to create a status card for content suggestions "
-                                + " when the category is NOT_PROVIDED.");
-                return null;
-
-            case CategoryStatus.LOADING_ERROR:
-                // In this case, the entire section should have been cleared off the UI.
-                Log.wtf(TAG, "Attempted to create a status card for content suggestions "
-                                + " when the category is LOADING_ERROR.");
-                return null;
-
-            default:
-                Log.wtf(TAG, "Attempted to create a status card for an unknown value: %d",
-                        categoryStatus);
-                return null;
-        }
-    }
-
     protected StatusItem(int headerStringId, int descriptionStringId, int actionStringId) {
         mHeaderStringId = headerStringId;
         mDescriptionStringId = descriptionStringId;
         mActionStringId = actionStringId;
     }
 
-    protected abstract void performAction(Context context);
+    public static StatusItem createNoSuggestionsItem(SuggestionsCategoryInfo categoryInfo) {
+        return new StatusItem(R.string.ntp_status_card_title_no_suggestions,
+                categoryInfo.getNoSuggestionDescription(), 0);
+    }
+
+    protected void performAction(Context context) {}
 
     protected boolean hasAction() {
-        return true;
+        return mActionStringId != 0;
     }
 
     @Override

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsCategoryInfo.java

@@ -4,13 +4,29 @@
 
 package org.chromium.chrome.browser.ntp.cards;
 
+import android.support.annotation.StringRes;
+
+import org.chromium.base.Log;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.ntp.NewTabPageView.NewTabPageManager;
+import org.chromium.chrome.browser.ntp.snippets.CategoryInt;
 import org.chromium.chrome.browser.ntp.snippets.ContentSuggestionsCardLayout.ContentSuggestionsCardLayoutEnum;
 
+import org.chromium.chrome.browser.ntp.snippets.KnownCategories;
+
 /**
- * Contains static meta information about a Category. Equivalent of the CategoryInfo class in
+ * Contains meta information about a Category. Equivalent of the CategoryInfo class in
  * components/ntp_snippets/category_info.h.
  */
 public class SuggestionsCategoryInfo {
+    private static final String TAG = "NtpCards";
+
+    /**
+     * Id of the category.
+     */
+    @CategoryInt
+    private final int mCategory;
+
     /**
      * Localized title of the category.
      */
@@ -32,8 +48,10 @@ public class SuggestionsCategoryInfo {
     /** Whether this category should be shown if it offers no suggestions. */
     private final boolean mShowIfEmpty;
 
-    public SuggestionsCategoryInfo(String title, @ContentSuggestionsCardLayoutEnum int cardLayout,
-            boolean hasMoreButton, boolean showIfEmpty) {
+    public SuggestionsCategoryInfo(@CategoryInt int category, String title,
+            @ContentSuggestionsCardLayoutEnum int cardLayout, boolean hasMoreButton,
+            boolean showIfEmpty) {
+        mCategory = category;
         mTitle = title;
         mCardLayout = cardLayout;
         mHasMoreButton = hasMoreButton;
@@ -44,6 +62,11 @@ public class SuggestionsCategoryInfo {
         return mTitle;
     }
 
+    @CategoryInt
+    public int getCategory() {
+        return mCategory;
+    }
+
     @ContentSuggestionsCardLayoutEnum
     public int getCardLayout() {
         return mCardLayout;
@@ -56,4 +79,46 @@ public class SuggestionsCategoryInfo {
     public boolean showIfEmpty() {
         return mShowIfEmpty;
     }
+
+    /**
+     * Performs the appropriate action for the provided category, for the case where there are no
+     * suggestions available. In general, this consists in navigating to the view showing all the
+     * content, or fetching new content.
+     */
+    public void performEmptyStateAction(NewTabPageManager manager, NewTabPageAdapter adapter) {
+        switch (mCategory) {
+            case KnownCategories.ARTICLES:
+                adapter.reloadSnippets();
+                break;
+            case KnownCategories.BOOKMARKS:
+                manager.navigateToBookmarks();
+                break;
+            case KnownCategories.DOWNLOADS:
+                manager.navigateToDownloadManager();
+                break;
+            case KnownCategories.FOREIGN_TABS:
+                manager.navigateToRecentTabs();
+                break;
+            default:
+                Log.wtf(TAG, "'Empty State' action called for unsupported category: %d", mCategory);
+                break;
+        }
+    }
+
+    /**
+     * Returns the string to use as description for the status card that is displayed when there
+     * are no suggestions available for the provided category.
+     */
+    @StringRes
+    public int getNoSuggestionDescription() {
+        switch (mCategory) {
+            case KnownCategories.ARTICLES:
+                return R.string.ntp_status_card_no_articles;
+            case KnownCategories.BOOKMARKS:
+                return R.string.ntp_status_card_no_bookmarks;
+            default:
+                Log.wtf(TAG, "Requested description for unsupported category: %d", mCategory);
+                return 0;
+        }
+    }
 }

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java

@@ -5,7 +5,6 @@
 package org.chromium.chrome.browser.ntp.cards;
 
 import org.chromium.base.VisibleForTesting;
-import org.chromium.chrome.browser.ntp.cards.StatusItem.ActionDelegate;
 import org.chromium.chrome.browser.ntp.snippets.CategoryInt;
 import org.chromium.chrome.browser.ntp.snippets.CategoryStatus.CategoryStatusEnum;
 import org.chromium.chrome.browser.ntp.snippets.SectionHeader;
@@ -22,39 +21,18 @@ import java.util.List;
 public class SuggestionsSection implements ItemGroup {
     private final List<SnippetArticle> mSuggestions = new ArrayList<>();
     private final SectionHeader mHeader;
-    private StatusItem mStatus;
+    private final StatusItem mStatus;
     private final ProgressItem mProgressIndicator = new ProgressItem();
-    private final ActionDelegate mActionDelegate;
     private final ActionItem mMoreButton;
-    @CategoryInt
-    private final int mCategory;
     private final Observer mObserver;
+    private final SuggestionsCategoryInfo mCategoryInfo;
 
-    public SuggestionsSection(@CategoryInt int category, SuggestionsCategoryInfo info,
-            final NewTabPageAdapter adapter) {
-        this(category, info, adapter, new ActionDelegate() {
-            @Override
-            public void onButtonTapped() {
-                adapter.reloadSnippets();
-            }
-        });
-    }
-
-    @VisibleForTesting
-    SuggestionsSection(@CategoryInt int category, SuggestionsCategoryInfo info, Observer observer,
-            ActionDelegate actionDelegate) {
+    public SuggestionsSection(SuggestionsCategoryInfo info, Observer observer) {
         mHeader = new SectionHeader(info.getTitle());
-        mCategory = category;
+        mCategoryInfo = info;
         mObserver = observer;
-
-        // TODO(dgn): Properly define strings, actions, etc. for each section and category type.
-        if (info.hasMoreButton()) {
-            mMoreButton = new ActionItem(category);
-            mActionDelegate = null;
-        } else {
-            mMoreButton = null;
-            mActionDelegate = actionDelegate;
-        }
+        mMoreButton = new ActionItem(info);
+        mStatus = StatusItem.createNoSuggestionsItem(info);
     }
 
     @Override
@@ -65,7 +43,7 @@ public class SuggestionsSection implements ItemGroup {
         items.addAll(mSuggestions);
 
         if (mSuggestions.isEmpty()) items.add(mStatus);
-        if (mMoreButton != null) items.add(mMoreButton);
+        if (mCategoryInfo.hasMoreButton() || mSuggestions.isEmpty()) items.add(mMoreButton);
         if (mSuggestions.isEmpty()) items.add(mProgressIndicator);
 
         return Collections.unmodifiableList(items);
@@ -82,12 +60,14 @@ public class SuggestionsSection implements ItemGroup {
         int globalRemovedIndex = removedIndex + 1; // Header has index 0 in the section.
         mObserver.notifyItemRemoved(this, globalRemovedIndex);
 
-        if (!hasSuggestions()) {
-            // When the last suggestion is removed, we insert other items to display the status,
-            // notify about them too.
-            mObserver.notifyItemInserted(this, globalRemovedIndex);
-            mObserver.notifyItemInserted(this, globalRemovedIndex + (mMoreButton == null ? 1 : 2));
+        // If we still have some suggestions, we are done. Otherwise, we'll have to notify about the
+        // status-related items that are now present.
+        if (hasSuggestions()) return;
+        mObserver.notifyItemInserted(this, globalRemovedIndex); // Status card.
+        if (!mCategoryInfo.hasMoreButton()) {
+            mObserver.notifyItemInserted(this, globalRemovedIndex + 1); // Action card.
         }
+        mObserver.notifyItemInserted(this, globalRemovedIndex + 2); // Progress indicator.
     }
 
     public void removeSuggestionById(String idWithinCategory) {
@@ -118,6 +98,7 @@ public class SuggestionsSection implements ItemGroup {
 
         if (mMoreButton != null) {
             mMoreButton.setPosition(mSuggestions.size());
+            mMoreButton.setDismissable(mSuggestions.isEmpty());
         }
         mObserver.notifyGroupChanged(this, itemCountBefore, getItems().size());
     }
@@ -130,15 +111,14 @@ public class SuggestionsSection implements ItemGroup {
     }
 
     private void setStatusInternal(@CategoryStatusEnum int status) {
-        mStatus = StatusItem.create(status, mActionDelegate);
-
         if (!SnippetsBridge.isCategoryStatusAvailable(status)) mSuggestions.clear();
 
         mProgressIndicator.setVisible(SnippetsBridge.isCategoryLoading(status));
     }
 
+    @CategoryInt
     public int getCategory() {
-        return mCategory;
+        return mCategoryInfo.getCategory();
     }
 
     private void copyThumbnails(List<SnippetArticle> suggestions) {

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsBridge.java

@@ -202,9 +202,9 @@ public class SnippetsBridge implements SuggestionsSource {
     }
 
     @CalledByNative
-    private static SuggestionsCategoryInfo createSuggestionsCategoryInfo(
-            String title, int cardLayout, boolean hasMoreButton, boolean showIfEmpty) {
-        return new SuggestionsCategoryInfo(title, cardLayout, hasMoreButton, showIfEmpty);
+    private static SuggestionsCategoryInfo createSuggestionsCategoryInfo(int category, String title,
+            int cardLayout, boolean hasMoreButton, boolean showIfEmpty) {
+        return new SuggestionsCategoryInfo(category, title, cardLayout, hasMoreButton, showIfEmpty);
     }
 
     @CalledByNative

chrome/android/javatests/src/org/chromium/chrome/browser/ntp/snippets/ArticleSnippetsTest.java

@@ -173,8 +173,9 @@ public class ArticleSnippetsTest extends ChromeActivityTestCaseBase<ChromeActivi
                 0,  // Position
                 ContentSuggestionsCardLayout.MINIMAL_CARD);
 
-        mSnippetsSource.setInfoForCategory(KnownCategories.ARTICLES,  new SuggestionsCategoryInfo(
-                "Section Title", ContentSuggestionsCardLayout.FULL_CARD, false, true));
+        mSnippetsSource.setInfoForCategory(KnownCategories.ARTICLES,
+                new SuggestionsCategoryInfo(KnownCategories.ARTICLES, "Section Title",
+                        ContentSuggestionsCardLayout.FULL_CARD, false, true));
         mSnippetsSource.setStatusForCategory(KnownCategories.ARTICLES,
                 CategoryStatus.AVAILABLE);
         mSnippetsSource.setSuggestionsForCategory(KnownCategories.ARTICLES,

chrome/android/junit/src/org/chromium/chrome/browser/ntp/cards/ContentSuggestionsTestUtils.java

@@ -4,6 +4,7 @@
 
 package org.chromium.chrome.browser.ntp.cards;
 
+import org.chromium.chrome.browser.ntp.snippets.CategoryInt;
 import org.chromium.chrome.browser.ntp.snippets.ContentSuggestionsCardLayout;
 import org.chromium.chrome.browser.ntp.snippets.SnippetArticle;
 
@@ -25,13 +26,15 @@ public final class ContentSuggestionsTestUtils {
         return suggestions;
     }
 
-    public static SuggestionsCategoryInfo createInfo(boolean moreButton, boolean showIfEmpty) {
+    public static SuggestionsCategoryInfo createInfo(
+            @CategoryInt int category, boolean moreButton, boolean showIfEmpty) {
         return new SuggestionsCategoryInfo(
-                "", ContentSuggestionsCardLayout.FULL_CARD, moreButton, showIfEmpty);
+                category, "", ContentSuggestionsCardLayout.FULL_CARD, moreButton, showIfEmpty);
     }
 
     public static SuggestionsSection createSection(
             boolean moreButton, boolean showIfEmpty, ItemGroup.Observer observer) {
-        return new SuggestionsSection(42, createInfo(moreButton, showIfEmpty), observer, null);
+        SuggestionsCategoryInfo info = createInfo(42, moreButton, showIfEmpty);
+        return new SuggestionsSection(info, observer);
     }
 }

chrome/android/junit/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapterTest.java

@@ -33,6 +33,7 @@ import org.robolectric.annotation.Config;
 import static org.chromium.base.test.util.Matchers.greaterThanOrEqualTo;
 import static org.chromium.chrome.browser.ntp.cards.ContentSuggestionsTestUtils
         .createDummySuggestions;
+import static org.chromium.chrome.browser.ntp.cards.ContentSuggestionsTestUtils.createInfo;
 
 import org.chromium.base.Callback;
 import org.chromium.base.metrics.RecordHistogram;
@@ -57,7 +58,6 @@ import org.chromium.chrome.browser.signin.SigninManager;
 import org.chromium.chrome.browser.signin.SigninManager.SignInStateObserver;
 import org.chromium.testing.local.LocalRobolectricTestRunner;
 
-import java.nio.channels.UnsupportedAddressTypeException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -120,9 +120,7 @@ public class NewTabPageAdapterTest {
             expect(NewTabPageItem.VIEW_TYPE_HEADER);
             if (descriptor.mStatusCard) {
                 expect(NewTabPageItem.VIEW_TYPE_STATUS);
-                if (descriptor.mMoreButton) {
-                    expect(NewTabPageItem.VIEW_TYPE_ACTION);
-                }
+                expect(NewTabPageItem.VIEW_TYPE_ACTION);
                 expect(NewTabPageItem.VIEW_TYPE_PROGRESS);
             } else {
                 for (int i = 1; i <= descriptor.mNumSuggestions; i++) {
@@ -225,11 +223,11 @@ public class NewTabPageAdapterTest {
         RecordHistogram.disableForTests();
         RecordUserAction.disableForTests();
 
+        @CategoryInt
+        final int category = KnownCategories.ARTICLES;
         mSource = new FakeSuggestionsSource();
-        mSource.setStatusForCategory(KnownCategories.ARTICLES, CategoryStatus.INITIALIZING);
-        mSource.setInfoForCategory(KnownCategories.ARTICLES,
-                new SuggestionsCategoryInfo("Articles for you",
-                                           ContentSuggestionsCardLayout.FULL_CARD, false, true));
+        mSource.setStatusForCategory(category, CategoryStatus.INITIALIZING);
+        mSource.setInfoForCategory(category, createInfo(category, false, true));
         mAdapter = NewTabPageAdapter.create(new MockNewTabPageManager(mSource), null, null);
     }
 
@@ -248,36 +246,20 @@ public class NewTabPageAdapterTest {
     @Feature({"Ntp"})
     public void testSuggestionLoading() {
         assertItemsFor(sectionWithStatusCard());
-        assertEquals(NewTabPageItem.VIEW_TYPE_ABOVE_THE_FOLD, mAdapter.getItemViewType(0));
-        assertEquals(NewTabPageItem.VIEW_TYPE_HEADER, mAdapter.getItemViewType(1));
-        assertEquals(NewTabPageItem.VIEW_TYPE_STATUS, mAdapter.getItemViewType(2));
-        assertEquals(NewTabPageItem.VIEW_TYPE_PROGRESS, mAdapter.getItemViewType(3));
-        assertEquals(NewTabPageItem.VIEW_TYPE_FOOTER, mAdapter.getItemViewType(4));
-        assertEquals(NewTabPageItem.VIEW_TYPE_SPACING, mAdapter.getItemViewType(5));
 
-        List<SnippetArticle> suggestions = createDummySuggestions(3);
+        final int numSuggestions = 3;
+        List<SnippetArticle> suggestions = createDummySuggestions(numSuggestions);
         mSource.setStatusForCategory(KnownCategories.ARTICLES, CategoryStatus.AVAILABLE);
         mSource.setSuggestionsForCategory(KnownCategories.ARTICLES, suggestions);
 
-        int numItems = mAdapter.getItemCount();
-
-        // From the loaded items, cut out aboveTheFold and header from the front,
-        // and footer and bottom spacer from the back.
-        assertEquals(NewTabPageItem.VIEW_TYPE_ABOVE_THE_FOLD, mAdapter.getItemViewType(0));
-        assertEquals(NewTabPageItem.VIEW_TYPE_HEADER, mAdapter.getItemViewType(1));
-        assertArticlesEqual(suggestions, 2, numItems - 2);
-        assertEquals(NewTabPageItem.VIEW_TYPE_FOOTER, mAdapter.getItemViewType(numItems - 2));
-        assertEquals(NewTabPageItem.VIEW_TYPE_SPACING, mAdapter.getItemViewType(numItems - 1));
+        assertItemsFor(section(numSuggestions));
 
         // The adapter should ignore any new incoming data.
         mSource.setSuggestionsForCategory(KnownCategories.ARTICLES,
                 Arrays.asList(new SnippetArticle[] {new SnippetArticle(0, "foo", "title1", "pub1",
                         "txt1", "foo", "bar", 0, 0, 0, ContentSuggestionsCardLayout.FULL_CARD)}));
-        assertEquals(NewTabPageItem.VIEW_TYPE_ABOVE_THE_FOLD, mAdapter.getItemViewType(0));
-        assertEquals(NewTabPageItem.VIEW_TYPE_HEADER, mAdapter.getItemViewType(1));
-        assertArticlesEqual(suggestions, 2, numItems - 2);
-        assertEquals(NewTabPageItem.VIEW_TYPE_FOOTER, mAdapter.getItemViewType(numItems - 2));
-        assertEquals(NewTabPageItem.VIEW_TYPE_SPACING, mAdapter.getItemViewType(numItems - 1));
+
+        assertItemsFor(section(numSuggestions));
     }
 
     /**
@@ -291,37 +273,20 @@ public class NewTabPageAdapterTest {
         mSource.setSuggestionsForCategory(
                 KnownCategories.ARTICLES, new ArrayList<SnippetArticle>());
         assertItemsFor(sectionWithStatusCard());
-        assertEquals(NewTabPageItem.VIEW_TYPE_ABOVE_THE_FOLD, mAdapter.getItemViewType(0));
-        assertEquals(NewTabPageItem.VIEW_TYPE_HEADER, mAdapter.getItemViewType(1));
-        assertEquals(NewTabPageItem.VIEW_TYPE_STATUS, mAdapter.getItemViewType(2));
-        assertEquals(NewTabPageItem.VIEW_TYPE_PROGRESS, mAdapter.getItemViewType(3));
-        assertEquals(NewTabPageItem.VIEW_TYPE_FOOTER, mAdapter.getItemViewType(4));
-        assertEquals(NewTabPageItem.VIEW_TYPE_SPACING, mAdapter.getItemViewType(5));
 
         // We should load new suggestions when we get notified about them.
-        List<SnippetArticle> suggestions = createDummySuggestions(5);
+        final int numSuggestions = 5;
+        List<SnippetArticle> suggestions = createDummySuggestions(numSuggestions);
         mSource.setStatusForCategory(KnownCategories.ARTICLES, CategoryStatus.AVAILABLE);
         mSource.setSuggestionsForCategory(KnownCategories.ARTICLES, suggestions);
 
-        int numItems = mAdapter.getItemCount();
-
-        // From the loaded items, cut out aboveTheFold and header from the front,
-        // and footer and bottom spacer from the back.
-        assertEquals(NewTabPageItem.VIEW_TYPE_ABOVE_THE_FOLD, mAdapter.getItemViewType(0));
-        assertEquals(NewTabPageItem.VIEW_TYPE_HEADER, mAdapter.getItemViewType(1));
-        assertArticlesEqual(suggestions, 2, numItems - 2);
-        assertEquals(NewTabPageItem.VIEW_TYPE_FOOTER, mAdapter.getItemViewType(numItems - 2));
-        assertEquals(NewTabPageItem.VIEW_TYPE_SPACING, mAdapter.getItemViewType(numItems - 1));
+        assertItemsFor(section(numSuggestions));
 
         // The adapter should ignore any new incoming data.
         mSource.setSuggestionsForCategory(KnownCategories.ARTICLES,
                 Arrays.asList(new SnippetArticle[] {new SnippetArticle(0, "foo", "title1", "pub1",
                         "txt1", "foo", "bar", 0, 0, 0, ContentSuggestionsCardLayout.FULL_CARD)}));
-        assertEquals(NewTabPageItem.VIEW_TYPE_ABOVE_THE_FOLD, mAdapter.getItemViewType(0));
-        assertEquals(NewTabPageItem.VIEW_TYPE_HEADER, mAdapter.getItemViewType(1));
-        assertArticlesEqual(suggestions, 2, numItems - 2);
-        assertEquals(NewTabPageItem.VIEW_TYPE_FOOTER, mAdapter.getItemViewType(numItems - 2));
-        assertEquals(NewTabPageItem.VIEW_TYPE_SPACING, mAdapter.getItemViewType(numItems - 1));
+        assertItemsFor(section(numSuggestions));
     }
 
     /**
@@ -472,6 +437,7 @@ public class NewTabPageAdapterTest {
     @Test
     @Feature({"Ntp"})
     public void testSectionVisibleIfEmpty() {
+        @CategoryInt
         final int category = 42;
         final int sectionIdx = 1; // section 0 is the above-the-fold item, we test the one after.
         final List<SnippetArticle> articles =
@@ -481,9 +447,7 @@ public class NewTabPageAdapterTest {
         // Part 1: VisibleIfEmpty = true
         suggestionsSource = new FakeSuggestionsSource();
         suggestionsSource.setStatusForCategory(category, CategoryStatus.INITIALIZING);
-        suggestionsSource.setInfoForCategory(
-                category, new SuggestionsCategoryInfo(
-                                  "", ContentSuggestionsCardLayout.MINIMAL_CARD, false, true));
+        suggestionsSource.setInfoForCategory(category, createInfo(category, false, true));
 
         // 1.1 - Initial state
         mAdapter =
@@ -507,9 +471,7 @@ public class NewTabPageAdapterTest {
         // Part 2: VisibleIfEmpty = false
         suggestionsSource = new FakeSuggestionsSource();
         suggestionsSource.setStatusForCategory(category, CategoryStatus.INITIALIZING);
-        suggestionsSource.setInfoForCategory(
-                category, new SuggestionsCategoryInfo(
-                                  "", ContentSuggestionsCardLayout.MINIMAL_CARD, false, false));
+        suggestionsSource.setInfoForCategory(category, createInfo(category, false, false));
 
         // 2.1 - Initial state
         mAdapter =
@@ -530,6 +492,7 @@ public class NewTabPageAdapterTest {
     @Test
     @Feature({"Ntp"})
     public void testMoreButton() {
+        @CategoryInt
         final int category = 42;
         final int sectionIdx = 1; // section 0 is the above the fold, we test the one after.
         final List<SnippetArticle> articles =
@@ -540,9 +503,7 @@ public class NewTabPageAdapterTest {
         // Part 1: ShowMoreButton = true
         suggestionsSource = new FakeSuggestionsSource();
         suggestionsSource.setStatusForCategory(category, CategoryStatus.INITIALIZING);
-        suggestionsSource.setInfoForCategory(
-                category, new SuggestionsCategoryInfo(
-                                  "", ContentSuggestionsCardLayout.MINIMAL_CARD, true, true));
+        suggestionsSource.setInfoForCategory(category, createInfo(category, true, true));
 
         // 1.1 - Initial state.
         mAdapter =
@@ -566,9 +527,7 @@ public class NewTabPageAdapterTest {
         // Part 1: ShowMoreButton = false
         suggestionsSource = new FakeSuggestionsSource();
         suggestionsSource.setStatusForCategory(category, CategoryStatus.INITIALIZING);
-        suggestionsSource.setInfoForCategory(
-                category, new SuggestionsCategoryInfo(
-                                  "", ContentSuggestionsCardLayout.MINIMAL_CARD, false, true));
+        suggestionsSource.setInfoForCategory(category, createInfo(category, false, true));
 
         // 2.1 - Initial state.
         mAdapter =
@@ -627,9 +586,7 @@ public class NewTabPageAdapterTest {
 
         int dynamicCategory1 = 1010;
         List<SnippetArticle> dynamics1 = createDummySuggestions(5);
-        mSource.setInfoForCategory(
-                dynamicCategory1, new SuggestionsCategoryInfo("Dynamic 1",
-                                          ContentSuggestionsCardLayout.MINIMAL_CARD, true, false));
+        mSource.setInfoForCategory(dynamicCategory1, createInfo(dynamicCategory1, true, false));
         mSource.setStatusForCategory(dynamicCategory1, CategoryStatus.AVAILABLE);
         mSource.setSuggestionsForCategory(dynamicCategory1, dynamics1);
         mAdapter =
@@ -638,9 +595,7 @@ public class NewTabPageAdapterTest {
 
         int dynamicCategory2 = 1011;
         List<SnippetArticle> dynamics2 = createDummySuggestions(11);
-        mSource.setInfoForCategory(
-                dynamicCategory2, new SuggestionsCategoryInfo("Dynamic 2",
-                                          ContentSuggestionsCardLayout.MINIMAL_CARD, false, false));
+        mSource.setInfoForCategory(dynamicCategory2, createInfo(dynamicCategory1, false, false));
         mSource.setStatusForCategory(dynamicCategory2, CategoryStatus.AVAILABLE);
         mSource.setSuggestionsForCategory(dynamicCategory2, dynamics2);
         mAdapter =
@@ -757,6 +712,7 @@ public class NewTabPageAdapterTest {
         verify(adapter).notifyItemRemoved(2);
         verify(adapter).notifyItemInserted(2);
         verify(adapter).notifyItemInserted(3);
+        verify(adapter).notifyItemInserted(4);
 
         // Adapter content:
         // Idx | Item
@@ -764,16 +720,19 @@ public class NewTabPageAdapterTest {
         // 0   | Above-the-fold
         // 1   | Header
         // 2   | Status
-        // 3   | Progress Indicator
-        // 4   | Footer
-        // 5   | Spacer
+        // 3   | Action
+        // 4   | Progress Indicator
+        // 5   | Footer
+        // 6   | Spacer
 
         final int newSuggestionCount = 7;
+        final int changedCount = 3; // status, action and progress will be replaced by articles.
         suggestionsSource.setSuggestionsForCategory(
                 KnownCategories.ARTICLES, createDummySuggestions(newSuggestionCount));
         adapter.onNewSuggestions(KnownCategories.ARTICLES);
-        verify(adapter).notifyItemRangeChanged(2, 2); // status and progress replaced by articles.
-        verify(adapter).notifyItemRangeInserted(4, newSuggestionCount - 2);
+        verify(adapter).notifyItemRangeChanged(2, changedCount);
+        verify(adapter).notifyItemRangeInserted(
+                2 + changedCount, newSuggestionCount - changedCount);
 
         // Adapter content:
         // Idx | Item
@@ -787,8 +746,8 @@ public class NewTabPageAdapterTest {
         suggestionsSource.setSuggestionsForCategory(
                 KnownCategories.ARTICLES, createDummySuggestions(0));
         adapter.onCategoryStatusChanged(KnownCategories.ARTICLES, CategoryStatus.SIGNED_OUT);
-        verify(adapter, times(2)).notifyItemRangeChanged(2, 2);
-        verify(adapter).notifyItemRangeRemoved(4, newSuggestionCount - 2);
+        verify(adapter, times(2)).notifyItemRangeChanged(2, changedCount);
+        verify(adapter).notifyItemRangeRemoved(2 + changedCount, newSuggestionCount - changedCount);
     }
 
     @Test
@@ -800,18 +759,19 @@ public class NewTabPageAdapterTest {
         NewTabPageAdapter adapter = NewTabPageAdapter.create(ntpManager, null, null);
 
         assertEquals(5, adapter.getGroups().size());
-        ItemGroup signinPromoGroup = adapter.getGroup(4);
+        ItemGroup signinPromoGroup = adapter.getGroup(5);
 
         // Adapter content:
-        // Idx | Item
-        // ----|----------------
-        // 0   | Above-the-fold
-        // 1   | Header
-        // 2   | Status
-        // 3   | Progress Indicator
-        // 4   | Sign in promo
-        // 5   | Footer
-        // 6   | Spacer
+        // Idx | Item               | Group Index
+        // ----|--------------------|-------------
+        // 0   | Above-the-fold     | 0
+        // 1   | Header             | 1
+        // 2   | Status             | 1
+        // 3   | Action             | 1
+        // 4   | Progress Indicator | 1
+        // 5   | Sign in promo      | 2
+        // 6   | Footer             | 3
+        // 7   | Spacer             | 4
 
         assertEquals(1, signinPromoGroup.getItems().size());
         assertEquals(NewTabPageItem.VIEW_TYPE_PROMO, signinPromoGroup.getItems().get(0).getType());
@@ -832,9 +792,10 @@ public class NewTabPageAdapterTest {
                 .setNewTabPageSigninPromoDismissed(false);
         MockNewTabPageManager ntpManager = new MockNewTabPageManager(mSource);
         NewTabPageAdapter adapter = NewTabPageAdapter.create(ntpManager, null, null);
+        final int signInPromoIndex = 5;
 
         assertEquals(5, adapter.getGroups().size());
-        ItemGroup signinPromoGroup = adapter.getGroup(4);
+        ItemGroup signinPromoGroup = adapter.getGroup(signInPromoIndex);
 
         // Adapter content:
         // Idx | Item
@@ -842,14 +803,15 @@ public class NewTabPageAdapterTest {
         // 0   | Above-the-fold
         // 1   | Header
         // 2   | Status
-        // 3   | Progress Indicator
-        // 4   | Sign in promo
-        // 5   | Footer
-        // 6   | Spacer
+        // 3   | Action
+        // 4   | Progress Indicator
+        // 5   | Sign in promo
+        // 6   | Footer
+        // 7   | Spacer
 
         assertEquals(NewTabPageItem.VIEW_TYPE_PROMO, signinPromoGroup.getItems().get(0).getType());
 
-        adapter.dismissItem(4);
+        adapter.dismissItem(signInPromoIndex);
         assertTrue(signinPromoGroup.getItems().isEmpty());
         assertTrue(ChromePreferenceManager.getInstance(RuntimeEnvironment.application)
                            .getNewTabPageSigninPromoDismissed());
@@ -857,7 +819,7 @@ public class NewTabPageAdapterTest {
         adapter = NewTabPageAdapter.create(ntpManager, null, null);
         assertEquals(5, adapter.getGroups().size());
         // The items below the signin promo move up, footer is now at the position of the promo.
-        assertEquals(NewTabPageItem.VIEW_TYPE_FOOTER, adapter.getItemViewType(4));
+        assertEquals(NewTabPageItem.VIEW_TYPE_FOOTER, adapter.getItemViewType(signInPromoIndex));
     }
 
     /** Registers the category with hasMoreButton=false and showIfEmpty=true*/
@@ -867,9 +829,7 @@ public class NewTabPageAdapterTest {
         // AVAILABLE.
         suggestionsSource.setStatusForCategory(category, CategoryStatus.AVAILABLE);
         // Important: showIfEmpty flag to true.
-        suggestionsSource.setInfoForCategory(
-                category, new SuggestionsCategoryInfo(
-                                  "", ContentSuggestionsCardLayout.FULL_CARD, false, true));
+        suggestionsSource.setInfoForCategory(category, createInfo(category, false, true));
         suggestionsSource.setSuggestionsForCategory(
                 category, createDummySuggestions(suggestionCount));
     }
@@ -1038,11 +998,7 @@ public class NewTabPageAdapterTest {
 
         @Override
         public void closeContextMenu() {
-            throw new UnsupportedAddressTypeException();
-        }
-
-        public void setSuggestionsSource(SuggestionsSource suggestionsSource) {
-            mSuggestionsSource = suggestionsSource;
+            throw new UnsupportedOperationException();
         }
 
         @Override

chrome/android/junit/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSectionTest.java

@@ -4,27 +4,28 @@
 
 package org.chromium.chrome.browser.ntp.cards;
 
-import static org.chromium.chrome.browser.ntp.cards.ContentSuggestionsTestUtils.createDummySuggestions;
-import static org.chromium.chrome.browser.ntp.cards.ContentSuggestionsTestUtils.createInfo;
-import static org.chromium.chrome.browser.ntp.cards.ContentSuggestionsTestUtils.createSection;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
-import static org.mockito.Mockito.any;
-import static org.mockito.Mockito.anyInt;
-import static org.mockito.Mockito.eq;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+import static org.chromium.chrome.browser.ntp.cards.ContentSuggestionsTestUtils.createDummySuggestions;
+import static org.chromium.chrome.browser.ntp.cards.ContentSuggestionsTestUtils.createInfo;
+import static org.chromium.chrome.browser.ntp.cards.ContentSuggestionsTestUtils.createSection;
+
 import org.chromium.base.test.util.Feature;
 import org.chromium.chrome.browser.ntp.snippets.CategoryStatus;
 import org.chromium.chrome.browser.ntp.snippets.SnippetArticle;
 import org.chromium.testing.local.LocalRobolectricTestRunner;
-import org.junit.Test;
-import org.junit.runner.RunWith;
-import org.robolectric.annotation.Config;
 
 import java.util.List;
 
@@ -34,8 +35,10 @@ import java.util.List;
 @RunWith(LocalRobolectricTestRunner.class)
 @Config(manifest = Config.NONE)
 public class SuggestionsSectionTest {
-    /** Number of items in a section when there are no suggestions: header, status, progress. */
-    private static final int EMPTY_SECTION_COUNT = 3;
+    /**
+     * Number of items in a section when there are no suggestions: header, status, action, progress.
+     */
+    private static final int EMPTY_SECTION_COUNT = 4;
 
     @Test
     @Feature({"Ntp"})
@@ -44,33 +47,19 @@ public class SuggestionsSectionTest {
         List<SnippetArticle> snippets = createDummySuggestions(3);
         SuggestionsSection section;
 
-        // Part 1: ShowMoreButton = true.
-        section = new SuggestionsSection(42, createInfo(true, true), observerMock, null);
+        section = new SuggestionsSection(createInfo(42, true, true), observerMock);
         section.setStatus(CategoryStatus.AVAILABLE);
         assertNotNull(section.getActionItem());
 
-        // 1.1: Without snippets.
+        // Without snippets.
         assertEquals(-1, section.getDismissSiblingPosDelta(section.getActionItem()));
         assertEquals(1, section.getDismissSiblingPosDelta(section.getStatusItem()));
 
-        // 1.2: With snippets.
+        // With snippets.
         section.setSuggestions(snippets, CategoryStatus.AVAILABLE);
         assertEquals(0, section.getDismissSiblingPosDelta(section.getActionItem()));
         assertEquals(0, section.getDismissSiblingPosDelta(section.getStatusItem()));
         assertEquals(0, section.getDismissSiblingPosDelta(snippets.get(0)));
-
-        // Part 2: ShowMoreButton = false.
-        section = new SuggestionsSection(42, createInfo(false, true), observerMock, null);
-        section.setStatus(CategoryStatus.AVAILABLE);
-        assertNull(section.getActionItem());
-
-        // 2.1: Without snippets.
-        assertEquals(0, section.getDismissSiblingPosDelta(section.getStatusItem()));
-
-        // 2.2: With snippets.
-        section.setSuggestions(snippets, CategoryStatus.AVAILABLE);
-        assertEquals(0, section.getDismissSiblingPosDelta(section.getStatusItem()));
-        assertEquals(0, section.getDismissSiblingPosDelta(snippets.get(0)));
     }
 
     @Test
@@ -96,7 +85,6 @@ public class SuggestionsSectionTest {
     @Feature({"Ntp"})
     public void testSetStatusNotification() {
         ItemGroup.Observer observerMock = mock(ItemGroup.Observer.class);
-        final int emptySectionCount = 3;
         final int suggestionCount = 5;
         List<SnippetArticle> snippets = createDummySuggestions(suggestionCount);
 

chrome/browser/android/ntp/ntp_snippets_bridge.cc

@@ -179,7 +179,7 @@ base::android::ScopedJavaLocalRef<jobject> NTPSnippetsBridge::GetCategoryInfo(
   if (!info)
     return base::android::ScopedJavaLocalRef<jobject>(env, nullptr);
   return Java_SnippetsBridge_createSuggestionsCategoryInfo(
-      env, ConvertUTF16ToJavaString(env, info->title()),
+      env, category, ConvertUTF16ToJavaString(env, info->title()),
       static_cast<int>(info->card_layout()), info->has_more_button(),
       info->show_if_empty());
 }

components/ntp_snippets_strings.grdp

@@ -8,15 +8,12 @@
     <message name="IDS_SNIPPETS_DISABLED_GENERIC_PROMPT" desc="Title of the card explaining what action the user can take to get content suggestions on the New Tab Page." formatter_data="android_java">
       Get suggested content
     </message>
-    <message name="IDS_NTP_STATUS_CARD_TITLE_NO_BOOKMARKS" desc="On the New Tab Page, title of the status card explaining that there is no new content available in the bookmarks section." formatter_data="android_java">
+    <message name="IDS_NTP_STATUS_CARD_TITLE_NO_SUGGESTIONS" desc="On the New Tab Page, title of the status card explaining that there is no new content available in the section." formatter_data="android_java">
       Done for now
     </message>
     <message name="IDS_NTP_STATUS_CARD_NO_BOOKMARKS" desc="On the New Tab Page, text of the card explaining to the user that they can expect to see bookmarks in this area in the future." formatter_data="android_java">
       Your recently visited bookmarks will appear here.
     </message>
-    <message name="IDS_NTP_STATUS_CARD_TITLE_NO_ARTICLES" desc="On the New Tab Page, title of the status card explaining that there is no new content available in the articles section." formatter_data="android_java">
-      All Read
-    </message>
     <message name="IDS_NTP_STATUS_CARD_NO_ARTICLES" desc="On the New Tab Page, text of the card explaining to the user that they can expect to see suggested articles in this area in the future." formatter_data="android_java">
       More articles will appear when the time is right.
     </message>