Make RenderWidgetHostViewAura::CopyFromCompositingSurface readback layer

content/port/browser/render_widget_host_view_port.h

 // 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.
 
 #ifndef CONTENT_PORT_BROWSER_RENDER_WIDGET_HOST_VIEW_PORT_H_
 #define CONTENT_PORT_BROWSER_RENDER_WIDGET_HOST_VIEW_PORT_H_
 
 #include "base/callback.h"
 #include "base/process_util.h"
 #include "base/strings/string16.h"
@@ skipping 277 matching lines @@
                               gfx::Vector2dF current_fling_velocity) = 0;
 
   virtual void SetPopupType(WebKit::WebPopupType popup_type) = 0;
   virtual WebKit::WebPopupType GetPopupType() = 0;
 
   virtual BrowserAccessibilityManager*
       GetBrowserAccessibilityManager() const = 0;
   virtual void OnAccessibilityNotifications(
       const std::vector<AccessibilityHostMsg_NotificationParams>& params) = 0;
 
+  // Return a value that is incremented each time the renderer swaps a new frame
+  // to the view.
+  virtual uint32 RendererFrameNumber() = 0;
+  // Called each time the RenderWidgetHost receives a new frame for display from
+  // the renderer.
+  virtual void DidReceiveRendererFrame() = 0;
+
 #if defined(OS_MACOSX)
   // Called just before GetBackingStore blocks for an updated frame.
   virtual void AboutToWaitForBackingStoreMsg() = 0;
 
   // Does any event handling necessary for plugin IME; should be called after
   // the plugin has already had a chance to process the event. If plugin IME is
   // not enabled, this is a no-op, so it is always safe to call.
   // Returns true if the event was handled by IME.
   virtual bool PostProcessEventForPluginIme(
       const NativeWebKeyboardEvent& event) = 0;
@@ skipping 11 matching lines @@
 
 #if defined(OS_WIN) && defined(USE_AURA)
   virtual void SetParentNativeViewAccessible(
       gfx::NativeViewAccessible accessible_parent) = 0;
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PORT_BROWSER_RENDER_WIDGET_HOST_VIEW_PORT_H_