Add ON_FOCUS event to TileViews.

This event will allow the parent component to take an action when
the user focuses the TileView using keyboard.

Bug: 1106109
Change-Id: If34debc647637f0834db2bd34804c8e37a74320b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437708Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Cathy Li <chili@chromium.org>
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Cr-Commit-Position: refs/heads/master@{#812111}

chrome/android/java/src/org/chromium/chrome/browser/suggestions/tile/TileView.java

@@ -21,6 +21,7 @@ import org.chromium.chrome.R;
 public class TileView extends FrameLayout {
     private ImageView mBadgeView;
     private TextView mTitleView;
+    private Runnable mOnFocusViaSelectionListener;
     protected ImageView mIconView;
 
     /**
@@ -70,4 +71,22 @@ public class TileView extends FrameLayout {
         mTitleView.setLines(titleLines);
         mTitleView.setText(title);
     }
+
+    /** Specify the handler that will be invoked when this tile is highlighted by the user. */
+    void setOnFocusViaSelectionListener(Runnable listener) {
+        mOnFocusViaSelectionListener = listener;
+    }
+
+    @Override
+    public void setSelected(boolean isSelected) {
+        super.setSelected(isSelected);
+        if (isSelected && mOnFocusViaSelectionListener != null) {
+            mOnFocusViaSelectionListener.run();
+        }
+    }
+
+    @Override
+    public boolean isFocused() {
+        return super.isFocused() || (isSelected() && !isInTouchMode());
+    }
 }

chrome/android/java/src/org/chromium/chrome/browser/suggestions/tile/TileViewBinder.java

@@ -43,6 +43,9 @@ public class TileViewBinder {
             params.height = iconEdgeSize;
             params.topMargin = iconTopMarginSize;
             iconView.setLayoutParams(params);
+        } else if (propertyKey == TileViewProperties.ON_FOCUS_VIA_SELECTION) {
+            view.setOnFocusViaSelectionListener(
+                    model.get(TileViewProperties.ON_FOCUS_VIA_SELECTION));
         } else if (propertyKey == TileViewProperties.ON_CLICK) {
             view.setOnClickListener(model.get(TileViewProperties.ON_CLICK));
         } else if (propertyKey == TileViewProperties.ON_LONG_CLICK) {

chrome/android/java/src/org/chromium/chrome/browser/suggestions/tile/TileViewProperties.java

@@ -12,7 +12,7 @@ import org.chromium.ui.modelutil.PropertyModel.WritableIntPropertyKey;
 import org.chromium.ui.modelutil.PropertyModel.WritableObjectPropertyKey;
 
 /** TileView properties. */
-final class TileViewProperties {
+public final class TileViewProperties {
     /** The title of the tile. */
     public static final WritableObjectPropertyKey<String> TITLE = new WritableObjectPropertyKey<>();
 
@@ -30,6 +30,10 @@ final class TileViewProperties {
     /** Badge visibility. */
     public static final WritableBooleanPropertyKey BADGE_VISIBLE = new WritableBooleanPropertyKey();
 
+    /** Handler receiving focus events. */
+    public static final WritableObjectPropertyKey<Runnable> ON_FOCUS_VIA_SELECTION =
+            new WritableObjectPropertyKey<>();
+
     /** Handler receiving click events. */
     public static final WritableObjectPropertyKey<View.OnClickListener> ON_CLICK =
             new WritableObjectPropertyKey<>();
@@ -42,6 +46,7 @@ final class TileViewProperties {
     public static final WritableObjectPropertyKey<View.OnCreateContextMenuListener>
             ON_CREATE_CONTEXT_MENU = new WritableObjectPropertyKey<>();
 
-    public static final PropertyKey[] ALL_KEYS = new PropertyKey[] {ICON, TITLE, TITLE_LINES,
-            BADGE_VISIBLE, SHOW_LARGE_ICON, ON_CLICK, ON_LONG_CLICK, ON_CREATE_CONTEXT_MENU};
+    public static final PropertyKey[] ALL_KEYS =
+            new PropertyKey[] {ICON, TITLE, TITLE_LINES, BADGE_VISIBLE, SHOW_LARGE_ICON,
+                    ON_FOCUS_VIA_SELECTION, ON_CLICK, ON_LONG_CLICK, ON_CREATE_CONTEXT_MENU};
 }