[Explore sites]: Add native page frame for explore sites page.

Bug: 867488
Change-Id: I886f26467826aa4c2beda38785bd4961f375e338
Reviewed-on: https://chromium-review.googlesource.com/1174699Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Cathy Li <chili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584382}

chrome/android/java/res/layout/experimental_explore_sites_section.xml

@@ -17,7 +17,7 @@
         android:layout_height="wrap_content"
         android:layout_marginTop="@dimen/explore_sites_spacing"
         android:gravity="center"
-        android:text="@string/ntp_explore_sites_title" />
+        android:text="@string/explore_sites_title" />
 
     <LinearLayout
         android:id="@+id/explore_sites_tiles"

chrome/android/java/res/layout/explore_sites_main.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright 2018 The Chromium Authors. All rights reserved.
+     Use of this source code is governed by a BSD-style license that can be
+     found in the LICENSE file. -->
+
+<android.support.v7.widget.RecyclerView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/recycler_view"
+    android:layout_height="match_parent"
+    android:layout_width="match_parent" />

chrome/android/java/src/org/chromium/chrome/browser/UrlConstants.java

@@ -77,4 +77,7 @@ public class UrlConstants {
     public static final String CHROME_MEMEX_DEV_URL = "https://chrome-memex-dev.appspot.com/";
 
     public static final String CONTENT_SUGGESTIONS_SUFFIX = "#suggestions";
+
+    public static final String EXPLORE_HOST = "explore";
+    public static final String EXPLORE_URL = "chrome-native://explore";
 }

chrome/android/java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesPage.java

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.explore_sites;
+
+import android.app.Activity;
+import android.view.View;
+import android.view.ViewGroup;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.BasicNativePage;
+import org.chromium.chrome.browser.ChromeActivity;
+import org.chromium.chrome.browser.NativePageHost;
+import org.chromium.chrome.browser.UrlConstants;
+
+/**
+ * Provides functionality when the user interacts with the explore sites page.
+ */
+public class ExploreSitesPage extends BasicNativePage {
+    private ViewGroup mView;
+    private String mTitle;
+    private Activity mActivity;
+
+    /**
+     * Create a new instance of the explore sites page.
+     */
+    public ExploreSitesPage(ChromeActivity activity, NativePageHost host) {
+        super(activity, host);
+    }
+
+    @Override
+    protected void initialize(ChromeActivity activity, NativePageHost host) {
+        mActivity = activity;
+        mTitle = mActivity.getString(R.string.explore_sites_title);
+        mView = (ViewGroup) mActivity.getLayoutInflater().inflate(
+                R.layout.explore_sites_main, null);
+    }
+
+    @Override
+    public String getHost() {
+        return UrlConstants.EXPLORE_HOST;
+    }
+
+    @Override
+    public View getView() {
+        return mView;
+    }
+
+    @Override
+    public String getTitle() {
+        return mTitle;
+    }
+}

chrome/android/java/src/org/chromium/chrome/browser/ntp/NativePageFactory.java

@@ -16,6 +16,7 @@ import org.chromium.chrome.browser.TabLoadStatus;
 import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.bookmarks.BookmarkPage;
 import org.chromium.chrome.browser.download.DownloadPage;
+import org.chromium.chrome.browser.explore_sites.ExploreSitesPage;
 import org.chromium.chrome.browser.feed.FeedNewTabPage;
 import org.chromium.chrome.browser.history.HistoryPage;
 import org.chromium.chrome.browser.tab.Tab;
@@ -55,6 +56,10 @@ public class NativePageFactory {
             return new DownloadPage(activity, new TabShim(tab));
         }
 
+        protected NativePage buildExploreSitesPage(ChromeActivity activity, Tab tab) {
+            return new ExploreSitesPage(activity, new TabShim(tab));
+        }
+
         protected NativePage buildHistoryPage(ChromeActivity activity, Tab tab) {
             return new HistoryPage(activity, new TabShim(tab));
         }
@@ -68,7 +73,7 @@ public class NativePageFactory {
 
     @IntDef({NativePageType.NONE, NativePageType.CANDIDATE, NativePageType.NTP,
             NativePageType.BOOKMARKS, NativePageType.RECENT_TABS, NativePageType.DOWNLOADS,
-            NativePageType.HISTORY})
+            NativePageType.HISTORY, NativePageType.EXPLORE})
     @Retention(RetentionPolicy.SOURCE)
     public @interface NativePageType {
         int NONE = 0;
@@ -78,6 +83,7 @@ public class NativePageFactory {
         int RECENT_TABS = 4;
         int DOWNLOADS = 5;
         int HISTORY = 6;
+        int EXPLORE = 7;
     }
 
     private static @NativePageType int nativePageType(
@@ -104,6 +110,8 @@ public class NativePageFactory {
             return NativePageType.HISTORY;
         } else if (UrlConstants.RECENT_TABS_HOST.equals(host) && !isIncognito) {
             return NativePageType.RECENT_TABS;
+        } else if (UrlConstants.EXPLORE_HOST.equals(host)) {
+            return NativePageType.EXPLORE;
         } else {
             return NativePageType.NONE;
         }
@@ -154,6 +162,9 @@ public class NativePageFactory {
             case NativePageType.RECENT_TABS:
                 page = sNativePageBuilder.buildRecentTabsPage(activity, tab);
                 break;
+            case NativePageType.EXPLORE:
+                page = sNativePageBuilder.buildExploreSitesPage(activity, tab);
+                break;
             default:
                 assert false;
                 return null;

chrome/android/java/strings/android_chrome_strings.grd

@@ -2780,7 +2780,7 @@ To obtain new licenses, connect to the internet and play your downloaded content
       </message>
 
       <!-- Explore sites strings -->
-      <message name="IDS_NTP_EXPLORE_SITES_TITLE" desc="Title of a section showing different categories, each with a number of popular websites">
+      <message name="IDS_EXPLORE_SITES_TITLE" desc="Title of a section showing different categories, each with a number of popular websites">
         Explore
       </message>
       <message name="IDS_NTP_EXPLORE_SITES_MORE" desc="Text on a button leading to a complete view of all categories for all popular websites">

chrome/android/java_sources.gni

@@ -544,6 +544,7 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/explore_sites/ExperimentalExploreSitesSection.java",
   "java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesBridge.java",
   "java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesCategoryTile.java",
+  "java/src/org/chromium/chrome/browser/explore_sites/ExploreSitesPage.java",
   "java/src/org/chromium/chrome/browser/externalauth/ExternalAuthUtils.java",
   "java/src/org/chromium/chrome/browser/externalauth/UserRecoverableErrorHandler.java",
   "java/src/org/chromium/chrome/browser/externalauth/VerifiedHandler.java",

chrome/common/webui_url_constants.cc

@@ -173,6 +173,7 @@ const char kDeprecatedChromeUIHistoryFrameURL[] = "chrome://history-frame/";
 const char kChromeUIEocInternalsHost[] = "eoc-internals";
 const char kChromeUIJavaCrashURL[] = "chrome://java-crash/";
 const char kChromeUINativeBookmarksURL[] = "chrome-native://bookmarks/";
+const char kChromeUINativeExploreURL[] = "chrome-native://explore";
 const char kChromeUINativeHistoryURL[] = "chrome-native://history/";
 const char kChromeUINativeNewTabURL[] = "chrome-native://newtab/";
 const char kChromeUINativePhysicalWebDiagnosticsURL[] =

chrome/common/webui_url_constants.h

@@ -173,6 +173,7 @@ extern const char kDeprecatedChromeUIHistoryFrameURL[];
 extern const char kChromeUIEocInternalsHost[];
 extern const char kChromeUIJavaCrashURL[];
 extern const char kChromeUINativeBookmarksURL[];
+extern const char kChromeUINativeExploreURL[];
 extern const char kChromeUINativeHistoryURL[];
 extern const char kChromeUINativeNewTabURL[];
 extern const char kChromeUINativePhysicalWebDiagnosticsURL[];