Make RenderWidgetHostViewAura::CopyFromCompositingSurface readback layer

content/browser/renderer_host/render_widget_host_view_guest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
@@ skipping 150 matching lines @@
   // If accelerated surface buffers are getting swapped then we're not using
   // the software path.
   guest_->clear_damage_buffer();
   guest_->SendMessageToEmbedder(
       new BrowserPluginMsg_BuffersSwapped(
           guest_->instance_id(),
           params.size,
           params.mailbox_name,
           params.route_id,
           gpu_host_id));
+  DidReceiveRendererFrame();

[piman, 2013/07/02 01:49:09]

I suspect it's also needed in DidUpdateBackingStore.
Or maybe not, I don't know how the UpdateRect path works for the <webview> tag,
but I think it's supposed to work.

[danakj, 2013/07/03 18:05:39]

The function is empty except for NOTREACHED() so I think I'll leave it out?

 }
 
 void RenderWidgetHostViewGuest::AcceleratedSurfacePostSubBuffer(
     const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params,
     int gpu_host_id) {
   NOTREACHED();
 }
 
 void RenderWidgetHostViewGuest::OnSwapCompositorFrame(
     scoped_ptr<cc::CompositorFrame> frame) {
@@ skipping 14 matching lines @@
     shared_memory.GiveToProcess(embedder_pid, &frame_data->handle);
   }
 
   guest_->clear_damage_buffer();
   guest_->SendMessageToEmbedder(
       new BrowserPluginMsg_CompositorFrameSwapped(
           guest_->instance_id(),
           *frame,
           host_->GetRoutingID(),
           host_->GetProcess()->GetID()));
+  DidReceiveRendererFrame();
 }
 
 void RenderWidgetHostViewGuest::SetBounds(const gfx::Rect& rect) {
   SetSize(rect.size());
 }
 
 bool RenderWidgetHostViewGuest::OnMessageReceived(const IPC::Message& msg) {
   return platform_view_->OnMessageReceived(msg);
 }
 
@@ skipping 319 matching lines @@
     return;
   for (ui::GestureRecognizer::Gestures::iterator g_it = gestures->begin();
       g_it != gestures->end();
       ++g_it) {
     ForwardGestureEventToRenderer(*g_it);
   }
 }
 
 
 }  // namespace content