Make RenderWidgetHostViewAura::CopyFromCompositingSurface readback layer

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 456f6df7f52d0cef38aa64d6cb7f977223f3b113..48d3aeb372a183ac068db2782108e74eed3ebdaa 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -427,8 +427,10 @@ bool RenderWidgetHostImpl::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(ViewHostMsg_RequestMove, OnRequestMove)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetTooltipText, OnSetTooltipText)
     IPC_MESSAGE_HANDLER(ViewHostMsg_PaintAtSize_ACK, OnPaintAtSizeAck)
+#if defined(OS_MACOSX)
     IPC_MESSAGE_HANDLER(ViewHostMsg_CompositorSurfaceBuffersSwapped,
                         OnCompositorSurfaceBuffersSwapped)
+#endif
     IPC_MESSAGE_HANDLER_GENERIC(ViewHostMsg_SwapCompositorFrame,
                                 msg_is_ok = OnSwapCompositorFrame(msg))
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidOverscroll, OnOverscrolled)
@@ -1744,6 +1746,7 @@ void RenderWidgetHostImpl::OnPaintAtSizeAck(int tag, const gfx::Size& size) {
       Details<std::pair<int, gfx::Size> >(&details));
 }
 
+#if defined(OS_MACOSX)
 void RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwapped(
       const ViewHostMsg_CompositorSurfaceBuffersSwapped_Params& params) {
   TRACE_EVENT0("renderer_host",
@@ -1765,7 +1768,9 @@ void RenderWidgetHostImpl::OnCompositorSurfaceBuffersSwapped(
   gpu_params.latency_info = params.latency_info;
   view_->AcceleratedSurfaceBuffersSwapped(gpu_params,
                                           params.gpu_process_host_id);
+  view_->DidReceiveRendererFrame();
 }
+#endif  // OS_MACOSX
 
 bool RenderWidgetHostImpl::OnSwapCompositorFrame(
     const IPC::Message& message) {
@@ -1777,6 +1782,7 @@ bool RenderWidgetHostImpl::OnSwapCompositorFrame(
 
   if (view_) {
     view_->OnSwapCompositorFrame(frame.Pass());
+    view_->DidReceiveRendererFrame();
   } else {
     cc::CompositorFrameAck ack;
     if (frame->gl_frame_data) {
@@ -1936,6 +1942,7 @@ void RenderWidgetHostImpl::DidUpdateBackingStore(
     view_being_painted_ = true;
     view_->DidUpdateBackingStore(params.scroll_rect, params.scroll_delta,
                                  params.copy_rects, params.latency_info);
+    view_->DidReceiveRendererFrame();
     view_being_painted_ = false;
   }
 
@@ -2641,6 +2648,10 @@ void RenderWidgetHostImpl::FrameSwapped(const ui::LatencyInfo& latency_info) {
     Send(new ViewMsg_SetBrowserRenderingStats(routing_id_, rendering_stats_));
 }
 
+void RenderWidgetHostImpl::DidReceiveRendererFrame() {
+  view_->DidReceiveRendererFrame();
+}
+
 // static
 void RenderWidgetHostImpl::CompositorFrameDrawn(
     const ui::LatencyInfo& latency_info) {