Tab Capture: Backing store readbacks to YV12 VideoFrames.

content/browser/renderer_host/render_widget_host_view_guest.h

Index: content/browser/renderer_host/render_widget_host_view_guest.h
diff --git a/content/browser/renderer_host/render_widget_host_view_guest.h b/content/browser/renderer_host/render_widget_host_view_guest.h
index c84a2aea9c4958732a08c21216d58826330facd0..4c3bac952bb7d374301cecde697ad9734255bc8a 100644
--- a/content/browser/renderer_host/render_widget_host_view_guest.h
+++ b/content/browser/renderer_host/render_widget_host_view_guest.h
@@ -92,6 +92,13 @@ class CONTENT_EXPORT RenderWidgetHostViewGuest
       const gfx::Rect& src_subrect,
       const gfx::Size& dst_size,
       const base::Callback<void(bool, const SkBitmap&)>& callback) OVERRIDE;
+#if defined(OS_WIN)
+  virtual void CopyFromCompositingSurfaceToVideoFrame(
+      const gfx::Rect& src_subrect,
+      const gfx::Size& dst_size,
+      const base::Callback<void(media::VideoFrame*)>& callback) OVERRIDE;
+#endif
+
   virtual void OnAcceleratedCompositingStateChange() OVERRIDE;
   virtual void AcceleratedSurfaceBuffersSwapped(
       const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params,