Enqueuing new frames in a Surface should cause Displays to reaggregate it

content/browser/compositor/onscreen_display_client.h

 // Copyright 2014 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_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_
 #define CONTENT_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_
 
 #include "cc/surfaces/display_client.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "cc/surfaces/display.h"
 
 namespace cc {
 class ContextProvider;
 class SurfaceManager;
 }
 
 namespace content {
 
 // This class provides a DisplayClient implementation for drawing directly to an
 // onscreen context.
 class OnscreenDisplayClient : cc::DisplayClient {
  public:
   OnscreenDisplayClient(
       const scoped_refptr<cc::ContextProvider>& onscreen_context_provider,
       scoped_ptr<cc::OutputSurface> software_surface,
-      cc::SurfaceManager* manager);
+      cc::SurfaceManager* manager,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   virtual ~OnscreenDisplayClient();
 
   cc::Display* display() { return display_.get(); }
 
   // cc::DisplayClient implementation.
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface() OVERRIDE;
+  virtual void DisplayDamaged() OVERRIDE;
 
  private:
+  void Draw();
+
   scoped_refptr<cc::ContextProvider> onscreen_context_provider_;
   scoped_ptr<cc::OutputSurface> software_surface_;
   scoped_ptr<cc::Display> display_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  bool scheduled_draw_;
+
+  base::WeakPtrFactory<OnscreenDisplayClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OnscreenDisplayClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_ONSCREEN_DISPLAY_CLIENT_H_