Add support for highlighting menu items

chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuHandler.java

Index: chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuHandler.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuHandler.java b/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuHandler.java
index 29078598fb9c1cb2b837ea9a283d6e2e7bfa8cea..133da63286f8753bfb8d94e62efb48adea4470da 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuHandler.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/appmenu/AppMenuHandler.java
@@ -10,6 +10,7 @@ import android.content.res.TypedArray;
 import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
+import android.os.Handler;
 import android.view.ContextThemeWrapper;
 import android.view.Menu;
 import android.view.MenuItem;
@@ -37,6 +38,12 @@ public class AppMenuHandler {
     private final Activity mActivity;
 
     /**
+     * The resource id of the menu item to highlight when the menu next opens. A value of 0 means
+     * no item will be highlighted.  This value will be cleared after the menu is opened.
+     */
+    private int mHighlightMenuId;
+
+    /**
      * Constructs an AppMenuHandler object.
      * @param activity Activity that is using the AppMenu.
      * @param delegate Delegate used to check the desired AppMenu properties on show.
@@ -52,6 +59,13 @@ public class AppMenuHandler {
         mHardwareButtonMenuAnchor = activity.findViewById(R.id.menu_anchor_stub);
         assert mHardwareButtonMenuAnchor != null
                 : "Using AppMenu requires to have menu_anchor_stub view";
+
+        new Handler().postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                setMenuHighlight(R.id.offline_page_id);
+            }
+        }, 2000);
     }
 
     /**
@@ -65,16 +79,23 @@ public class AppMenuHandler {
         if (mAppMenu != null) mAppMenu.menuItemContentChanged(menuRowId);
     }
 
+    public void setMenuHighlight(int highlightItemId) {
+        if (mHighlightMenuId == highlightItemId) return;
+        mHighlightMenuId = highlightItemId;
+        boolean highlighting = mHighlightMenuId != 0;
+        for (AppMenuObserver observer : mObservers) observer.onMenuHighlightChanged(highlighting);
+    }
+
     /**
      * Show the app menu.
-     * @param anchorView         Anchor view (usually a menu button) to be used for the popup, if
-     *                           null is passed then hardware menu button anchor will be used.
-     * @param startDragging      Whether dragging is started. For example, if the app menu is
-     *                           showed by tapping on a button, this should be false. If it is
-     *                           showed by start dragging down on the menu button, this should
-     *                           be true. Note that if anchorView is null, this must
-     *                           be false since we no longer support hardware menu button
-     *                           dragging.
+     * @param anchorView        Anchor view (usually a menu button) to be used for the popup, if
+     *                          null is passed then hardware menu button anchor will be used.
+     * @param startDragging     Whether dragging is started. For example, if the app menu is
+     *                          showed by tapping on a button, this should be false. If it is
+     *                          showed by start dragging down on the menu button, this should
+     *                          be true. Note that if anchorView is null, this must
+     *                          be false since we no longer support hardware menu button
+     *                          dragging.
      * @return True, if the menu is shown, false, if menu is not shown, example reasons:
      *         the menu is not yet available to be shown, or the menu is already showing.
      */
@@ -136,9 +157,10 @@ public class AppMenuHandler {
         }
         Point pt = new Point();
         mActivity.getWindowManager().getDefaultDisplay().getSize(pt);
-        mAppMenu.show(wrapper, anchorView, isByPermanentButton,
-                rotation, appRect, pt.y, mDelegate.getFooterResourceId());
+        mAppMenu.show(wrapper, anchorView, isByPermanentButton, rotation, appRect, pt.y,
+                mDelegate.getFooterResourceId(), mHighlightMenuId);
         mAppMenuDragHelper.onShow(startDragging);
+        setMenuHighlight(0);
         RecordUserAction.record("MobileMenuShow");
         return true;
     }