[Android] Fix a flicker in stopping Chrome

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

 // Copyright 2014 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;
 
 import android.app.Activity;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Color;
@@ skipping 1069 matching lines @@
 
         // When resuming the activity, force an update to the fullscreen state to ensure a
         // subactivity did not change the fullscreen configuration of this ChromeTab's renderer in
         // the case where it was shared (i.e. via an EmbedContentViewActivity).
         updateFullscreenEnabledState();
     }
 
     /**
      * Called on the foreground tab when the Activity is stopped.
      */
+    // TODO(changwan): remove this
     public void onActivityStop() {
         hide();
     }
 
     /**
      * Prepares the tab to be shown. This method is supposed to be called before the tab is
      * displayed. It restores the ContentView if it is not available after the cold start and
      * reloads the tab if its renderer has crashed.
      * @param type Specifies how the tab was selected.
      */
@@ skipping 1281 matching lines @@
     private native boolean nativePrint(long nativeTabAndroid);
     private native Bitmap nativeGetFavicon(long nativeTabAndroid);
     private native void nativeCreateHistoricalTab(long nativeTabAndroid);
     private native void nativeUpdateTopControlsState(
             long nativeTabAndroid, int constraints, int current, boolean animate);
     private native void nativeSearchByImageInNewTabAsync(long nativeTabAndroid);
     private native void nativeSetInterceptNavigationDelegate(long nativeTabAndroid,
             InterceptNavigationDelegate delegate);
     private static native void nativeRecordStartupToCommitUma();
 }