Adding compositor callbacks to RenderWidgetHostViewAndroid

content/browser/renderer_host/compositor_impl_android.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_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/observer_list.h"
 #include "cc/resources/ui_resource_client.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
 #include "content/browser/renderer_host/image_transport_factory_android.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 #include "content/public/browser/android/compositor.h"
 
 struct ANativeWindow;
 
 namespace cc {
 class InputHandlerClient;
 class Layer;
 class LayerTreeHost;
 class ScopedUIResource;
 }
 
 namespace content {
 class CompositorClient;
+class CompositorObserver;
 class GraphicsContext;
 
 // -----------------------------------------------------------------------------
 // Browser-side compositor that manages a tree of content and UI layers.
 // -----------------------------------------------------------------------------
 class CONTENT_EXPORT CompositorImpl
     : public Compositor,
       public cc::LayerTreeHostClient,
       public cc::LayerTreeHostSingleThreadClient,
       public ImageTransportFactoryAndroidObserver {
@@ skipping 33 matching lines @@
   virtual void WillBeginMainFrame() OVERRIDE {}
   virtual void DidBeginMainFrame() OVERRIDE {}
   virtual void Animate(double frame_begin_time) OVERRIDE {}
   virtual void Layout() OVERRIDE {}
   virtual void ApplyScrollAndScale(gfx::Vector2d scroll_delta,
                                    float page_scale) OVERRIDE {}
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(bool fallback)
       OVERRIDE;
   virtual void DidInitializeOutputSurface(bool success) OVERRIDE {}
   virtual void WillCommit() OVERRIDE {}
-  virtual void DidCommit() OVERRIDE {}
+  virtual void DidCommit() OVERRIDE;
   virtual void DidCommitAndDrawFrame() OVERRIDE {}
   virtual void DidCompleteSwapBuffers() OVERRIDE;
   virtual scoped_refptr<cc::ContextProvider>
       OffscreenContextProvider() OVERRIDE;
 
   // LayerTreeHostSingleThreadClient implementation.
   virtual void ScheduleComposite() OVERRIDE;
   virtual void DidPostSwapBuffers() OVERRIDE;
   virtual void DidAbortSwapBuffers() OVERRIDE;
 
   // ImageTransportFactoryAndroidObserver implementation.
   virtual void OnLostResources() OVERRIDE;
 
+  // Compositor does not own observers. It is the responsibility of the
+  // observer to remove itself when it is done observing.
+  virtual void AddObserver(CompositorObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(CompositorObserver* observer) OVERRIDE;
+  virtual bool HasObserver(CompositorObserver* observer) OVERRIDE;
+
  private:
   blink::WebGLId BuildBasicTexture();
   blink::WGC3Denum GetGLFormatForBitmap(gfx::JavaBitmap& bitmap);
   blink::WGC3Denum GetGLTypeForBitmap(gfx::JavaBitmap& bitmap);
 
   scoped_refptr<cc::Layer> root_layer_;
   scoped_ptr<cc::LayerTreeHost> host_;
 
   gfx::Size size_;
   bool has_transparent_background_;
 
   ANativeWindow* window_;
   int surface_id_;
 
   CompositorClient* client_;
 
   scoped_refptr<cc::ContextProvider> null_offscreen_context_provider_;
 
   typedef base::ScopedPtrHashMap<cc::UIResourceId, cc::ScopedUIResource>
         UIResourceMap;
   UIResourceMap ui_resource_map_;
 
+  ObserverList<CompositorObserver> observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(CompositorImpl);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITOR_IMPL_ANDROID_H_