Tab Capture: Backing store readbacks to YV12 VideoFrames.

content/browser/renderer_host/render_widget_host_view_guest.cc

Index: content/browser/renderer_host/render_widget_host_view_guest.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_guest.cc b/content/browser/renderer_host/render_widget_host_view_guest.cc
index 0039df7966654ce7c0fc6efd6c2ebdae74151f49..f0cd67a7b15e3a0a25a1492ca5766187b63d578c 100644
--- a/content/browser/renderer_host/render_widget_host_view_guest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_guest.cc
@@ -212,6 +212,15 @@ void RenderWidgetHostViewGuest::CopyFromCompositingSurface(
   callback.Run(false, SkBitmap());
 }
 
+#if defined(OS_WIN)
+void RenderWidgetHostViewGuest::CopyFromCompositingSurfaceToVideoFrame(
+    const gfx::Rect& src_subrect,
+    const gfx::Size& /* dst_size */,
+    const base::Callback<void(media::VideoFrame*)>& callback) {
+  callback.Run(media::VideoFrame::CreateEmptyFrame());
+}
+#endif
+
 void RenderWidgetHostViewGuest::AcceleratedSurfaceSuspend() {
 }