Implement GLHelperReadbackSupport for GLHelper usage.

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 231 matching lines @@
 
   // Returns true when animation ticks are still needed. This avoids a separate
   // round-trip for requesting follow-up animation.
   bool Animate(base::TimeTicks frame_time);
 
   void SynchronousFrameMetadata(
       const cc::CompositorFrameMetadata& frame_metadata);
 
   void SetOverlayVideoMode(bool enabled);
 
+  bool IsReadBackConfigSupported(const SkBitmap::Config& bitmap_config);

[vivekg, 2014/02/20 00:53:31]

nit: IsReadBackConfigSupported -> IsReadbackConfigSupported

here and all other usages.

+
  private:
   void BuffersSwapped(const gpu::Mailbox& mailbox,
                       uint32_t output_surface_id,
                       const base::Closure& ack_callback);
 
   void RunAckCallbacks();
 
   void DestroyDelegatedContent();
   void SwapDelegatedFrame(uint32 output_surface_id,
                           scoped_ptr<cc::DelegatedFrameData> frame_data);
@@ skipping 97 matching lines @@
   scoped_ptr<DelegatedFrameEvictor> frame_evictor_;
 
   bool using_delegated_renderer_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_