Tab Capture: Backing store readbacks to YV12 VideoFrames.

content/browser/renderer_host/render_widget_host_view_win.h

Index: content/browser/renderer_host/render_widget_host_view_win.h
diff --git a/content/browser/renderer_host/render_widget_host_view_win.h b/content/browser/renderer_host/render_widget_host_view_win.h
index 357b8452d1c9201156a24634be706b54bc02e451..9dd91747413c375791f22c57d834f468429907e3 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.h
+++ b/content/browser/renderer_host/render_widget_host_view_win.h
@@ -206,6 +206,10 @@ class RenderWidgetHostViewWin
       const gfx::Rect& src_subrect,
       const gfx::Size& dst_size,
       const base::Callback<void(bool, const SkBitmap&)>& callback) OVERRIDE;
+  virtual void CopyFromCompositingSurfaceToVideoFrame(
+      const gfx::Rect& src_subrect,
+      const gfx::Size& dst_size,
+      const base::Callback<void(media::VideoFrame*)>& callback) OVERRIDE;
   virtual void OnAcceleratedCompositingStateChange() OVERRIDE;
   virtual void ProcessAckedTouchEvent(const WebKit::WebTouchEvent& touch,
                                       InputEventAckState ack_result) OVERRIDE;