Tab Capture: Backing store readbacks to YV12 VideoFrames.

content/browser/renderer_host/render_widget_host_view_gtk.cc

Index: content/browser/renderer_host/render_widget_host_view_gtk.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_gtk.cc b/content/browser/renderer_host/render_widget_host_view_gtk.cc
index a93df0923ccab0be214eb54b1b74533ac1c7fc23..ca71db99b562caf36bcb11ec0a5dd4dd40273da0 100644
--- a/content/browser/renderer_host/render_widget_host_view_gtk.cc
+++ b/content/browser/renderer_host/render_widget_host_view_gtk.cc
@@ -1064,6 +1064,18 @@ void RenderWidgetHostViewGtk::CopyFromCompositingSurface(
   callback.Run(true, bitmap);
 }
 
+void RenderWidgetHostViewGtk::CopyFromCompositingSurfaceToVideoFrame(
+      const gfx::Rect& src_subrect,
+      const scoped_refptr<media::VideoFrame>& target,
+      const base::Callback<void(bool)>& callback) {
+  NOTIMPLEMENTED();
+  callback.Run(false);
+}
+
+bool RenderWidgetHostViewGtk::CanCopyToVideoFrame() const {
+  return false;
+}
+
 void RenderWidgetHostViewGtk::AcceleratedSurfaceBuffersSwapped(
     const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params,
     int gpu_host_id) {