[Android] Fix a flicker in stopping Chrome

content/public/browser/android/compositor.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_
 
 #include "base/callback.h"
 #include "cc/resources/ui_resource_bitmap.h"
 #include "content/common/content_export.h"
@@ skipping 57 matching lines @@
   // Request layout and draw. You only need to call this if you need to trigger
   // Composite *without* having modified the layer tree.
   virtual void SetNeedsComposite() = 0;
 
   // Returns the UI resource provider associated with the compositor.
   virtual ui::UIResourceProvider& GetUIResourceProvider() = 0;
 
   // Returns the resource manager associated with the compositor.
   virtual ui::ResourceManager& GetResourceManager() = 0;
 
+  // Pause the compositor, for the cases, e.g., when you want to make sure that
+  // tab is visible even when you are releasing resources in stopping the
+  // activity.
+  virtual void Pause() = 0;
+
+  // Resume the compositor.
+  virtual void Resume() = 0;
+
  protected:
   Compositor() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_COMPOSITOR_H_