Add RGB565 Texture readback support in gl_helper

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index 193efbd5b44550504371d9a08247d7ca718bcc17..c1c6afae1c2f11d02caa5d557e3dec54c8b16042 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -209,7 +209,8 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
   virtual void CopyFromCompositingSurface(
       const gfx::Rect& src_subrect,
       const gfx::Size& dst_size,
-      const base::Callback<void(bool, const SkBitmap&)>& callback) OVERRIDE;
+      const base::Callback<void(bool, const SkBitmap&)>& callback,
+      bool readback_config_rgb565) OVERRIDE;
   virtual void CopyFromCompositingSurfaceToVideoFrame(
       const gfx::Rect& src_subrect,
       const scoped_refptr<media::VideoFrame>& target,
@@ -494,6 +495,7 @@ class CONTENT_EXPORT RenderWidgetHostViewAura
       scoped_ptr<cc::CopyOutputResult> result);
   static void PrepareTextureCopyOutputResult(
       const gfx::Size& dst_size_in_pixel,
+      bool readback_config_rgb565,
       const base::Callback<void(bool, const SkBitmap&)>& callback,
       scoped_ptr<cc::CopyOutputResult> result);
   static void PrepareBitmapCopyOutputResult(