Make RenderWidgetHostViewAura::CopyFromCompositingSurface readback layer

content/browser/renderer_host/render_widget_host_view_base.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 "content/browser/renderer_host/render_widget_host_view_base.h"
 
 #include "base/logging.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
@@ skipping 338 matching lines @@
 }
 
 #endif  // OS_WIN
 
 RenderWidgetHostViewBase::RenderWidgetHostViewBase()
     : popup_type_(WebKit::WebPopupTypeNone),
       mouse_locked_(false),
       showing_context_menu_(false),
       selection_text_offset_(0),
       selection_range_(ui::Range::InvalidRange()),
-      current_device_scale_factor_(0) {
+      current_device_scale_factor_(0),
+      renderer_frame_number_(0) {
 }
 
 RenderWidgetHostViewBase::~RenderWidgetHostViewBase() {
   DCHECK(!mouse_locked_);
 }
 
 bool RenderWidgetHostViewBase::OnMessageReceived(const IPC::Message& msg){
   return false;
 }
 
@@ skipping 144 matching lines @@
   RenderProcessHostImpl* render_process_host =
       static_cast<RenderProcessHostImpl*>(impl->GetProcess());
   render_process_host->EndFrameSubscription(impl->GetRoutingID());
 }
 
 void RenderWidgetHostViewBase::OnOverscrolled(
     gfx::Vector2dF accumulated_overscroll,
     gfx::Vector2dF current_fling_velocity) {
 }
 
+uint32 RenderWidgetHostViewBase::RendererFrameNumber() {
+  return renderer_frame_number_;
+}
+
+void RenderWidgetHostViewBase::DidReceiveRendererFrame() {
+  ++renderer_frame_number_;
+}
+
 }  // namespace content