Very basic Android browser-side compositing support.

content/browser/renderer_host/render_widget_host_impl.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_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <string>
@@ skipping 27 matching lines @@
 class Range;
 }
 
 namespace WebKit {
 class WebInputEvent;
 class WebMouseEvent;
 struct WebCompositionUnderline;
 struct WebScreenInfo;
 }
 
+#if defined(OS_ANDROID)
+namespace WebKit {
+class WebLayer;
+}
+#endif
+
 namespace content {
 class BackingStore;
 class GestureEventFilter;
 class RenderWidgetHostDelegate;
 class RenderWidgetHostViewPort;
 class SmoothScrollGesture;
 
 // This implements the RenderWidgetHost interface that is exposed to
 // embedders of content, and adds things only visible to content.
 class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
@@ skipping 331 matching lines @@
 #endif
 
   // Signals that the compositing surface was updated, e.g. after a lost context
   // event.
   void CompositingSurfaceUpdated();
 
   void set_allow_privileged_mouse_lock(bool allow) {
     allow_privileged_mouse_lock_ = allow;
   }
 
+#if defined(OS_ANDROID)
+  virtual void AttachLayer(WebKit::WebLayer* layer) {}
+  virtual void RemoveLayer(WebKit::WebLayer* layer) {}
+#endif
+
  protected:
   virtual RenderWidgetHostImpl* AsRenderWidgetHostImpl() OVERRIDE;
 
   // Internal implementation of the public Forward*Event() methods.
   void ForwardInputEvent(const WebKit::WebInputEvent& input_event,
                          int event_size, bool is_keyboard_shortcut);
 
   // Called when we receive a notification indicating that the renderer
   // process has gone. This will reset our state so that our state will be
   // consistent if a new renderer is created.
@@ skipping 381 matching lines @@
   SmoothScrollGestureMap active_smooth_scroll_gestures_;
 
   scoped_ptr<GestureEventFilter> gesture_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_