All together now

content/browser/aura/browser_compositor_output_surface.h

 // Copyright (c) 2013 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_AURA_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_BROWSER_AURA_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include "base/id_map.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "cc/output/output_surface.h"
 
 namespace base { class MessageLoopProxy; }
 
 namespace ui { class Compositor; }
 
 namespace content {
 class ContextProviderCommandBuffer;
-class ReflectorImpl;
 class WebGraphicsContext3DCommandBufferImpl;
 
 // Adapts a WebGraphicsContext3DCommandBufferImpl into a
 // cc::OutputSurface that also handles vsync parameter updates
 // arriving from the GPU process.
 class BrowserCompositorOutputSurface
     : public cc::OutputSurface,
       public base::NonThreadSafe {
  public:
+  // Observer class for objects to be notified of events on the output surface.
+  // These will be called on the the thread the BrowserCompositorOutputSurface
+  // binds to in BindToClient().
+  class Observer {
+   public:
+    // Called when the output surface's size has changed.
+    virtual void OnReshape(const gfx::Size& size) = 0;
+
+    // Called when the output surface swaps to the frontbuffer.
+    virtual void OnSwapBuffers() = 0;
+
+    // Called when the output surface posts a subbuffer to the frontbuffer.
+    virtual void OnPostSubBuffer(const gfx::Rect& rect) = 0;
+
+    // Called when the output surface is about to be deleted.
+    virtual void OnDelete() = 0;
+  };
+
   BrowserCompositorOutputSurface(
       const scoped_refptr<ContextProviderCommandBuffer>& context,
       int surface_id,
       IDMap<BrowserCompositorOutputSurface>* output_surface_map,
-      base::MessageLoopProxy* compositor_message_loop,
+      const scoped_refptr<base::MessageLoopProxy>& compositor_message_loop,
       base::WeakPtr<ui::Compositor> compositor);
 
   virtual ~BrowserCompositorOutputSurface();
 
   // cc::OutputSurface implementation.
   virtual bool BindToClient(cc::OutputSurfaceClient* client) OVERRIDE;
   virtual void Reshape(gfx::Size size, float scale_factor) OVERRIDE;
   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
 
   void OnUpdateVSyncParameters(base::TimeTicks timebase,
                                base::TimeDelta interval);
 
-  void SetReflector(ReflectorImpl* reflector);
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
 
  private:
   int surface_id_;
   IDMap<BrowserCompositorOutputSurface>* output_surface_map_;
 
   scoped_refptr<base::MessageLoopProxy> compositor_message_loop_;
   base::WeakPtr<ui::Compositor> compositor_;
-  scoped_refptr<ReflectorImpl> reflector_;
+  ObserverList<Observer> observer_list_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_AURA_BROWSER_COMPOSITOR_OUTPUT_SURFACE_H_