[Android] Use UIResource for overscroll glow

content/browser/renderer_host/render_widget_host_view_android.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <map>
 #include <queue>
 
@@ skipping 336 matching lines @@
 
   // The output surface id of the last received frame.
   uint32_t last_output_surface_id_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAndroid> weak_ptr_factory_;
 
   std::queue<base::Closure> ack_callbacks_;
 
   const bool overscroll_effect_enabled_;
   // Used to render overscroll overlays.
-  // Note: |overscroll_effect_| will never be NULL, even if it's never enabled.
   scoped_ptr<OverscrollGlow> overscroll_effect_;
 
   // Provides gesture synthesis given a stream of touch events (derived from
   // Android MotionEvent's) and touch event acks.
   ui::FilteredGestureProvider gesture_provider_;
 
   // Handles gesture based text selection
   GestureTextSelector gesture_text_selector_;
 
   // Manages selection handle rendering and manipulation.
@@ skipping 27 matching lines @@
   scoped_ptr<LastFrameInfo> last_frame_info_;
 
   TextSurroundingSelectionCallback text_surrounding_selection_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_