Tab Capture: Backing store readbacks to YV12 VideoFrames.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index b0e033ca8cf14a3e08dba00bf328c4aa9df07564..4525b04cc7a7ab72e9d4432d64d7f19bc9dcc8f7 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -966,6 +966,18 @@ void RenderWidgetHostViewMac::CopyFromCompositingSurface(
       callback);
 }
 
+void RenderWidgetHostViewMac::CopyFromCompositingSurfaceToVideoFrame(
+      const gfx::Rect& src_subrect,
+      const scoped_refptr<media::VideoFrame>& target,
+      const base::Callback<void(bool)>& callback) {
+  NOTIMPLEMENTED();
+  callback.Run(false);
+}
+
+bool RenderWidgetHostViewMac::CanCopyToVideoFrame() const {
+  return false;
+}
+
 // Sets whether or not to accept first responder status.
 void RenderWidgetHostViewMac::SetTakesFocusOnlyOnMouseDown(bool flag) {
   [cocoa_view_ setTakesFocusOnlyOnMouseDown:flag];