[Android] Implement asynchronous zero-copy bitmap capture API.

content/browser/renderer_host/render_widget_host_view_gtk.h

Index: content/browser/renderer_host/render_widget_host_view_gtk.h
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.h b/content/browser/renderer_host/render_widget_host_view_gtk.h
index dfb4dc70b46d3ac9be82c173c3af09d1243fc62e..1c03246d1a4f085e05b049b885c219141e5550b2 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.h
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.h
@@ -105,7 +105,8 @@ class CONTENT_EXPORT RenderWidgetHostViewGtk
       const gfx::Rect& src_subrect,
       const gfx::Size& dst_size,
       const base::Callback<void(bool, const SkBitmap&)>& callback,
-      SkBitmap::Config config) OVERRIDE;
+      SkBitmap::Config config,
+      scoped_ptr<SkBitmap> bitmap) OVERRIDE;
   virtual void CopyFromCompositingSurfaceToVideoFrame(
       const gfx::Rect& src_subrect,
       const scoped_refptr<media::VideoFrame>& target,