Very basic Android browser-side compositing support.

content/browser/renderer_host/render_view_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_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 348 matching lines @@
   virtual void GotFocus() OVERRIDE;
   virtual void LostCapture() OVERRIDE;
   virtual void LostMouseLock() OVERRIDE;
   virtual void ForwardMouseEvent(
       const WebKit::WebMouseEvent& mouse_event) OVERRIDE;
   virtual void OnPointerEventActivate() OVERRIDE;
   virtual void ForwardKeyboardEvent(
       const NativeWebKeyboardEvent& key_event) OVERRIDE;
   virtual gfx::Rect GetRootWindowResizerRect() const OVERRIDE;
 
+#if defined(OS_ANDROID)
+  virtual void AttachLayer(WebKit::WebLayer* layer) OVERRIDE;
+  virtual void RemoveLayer(WebKit::WebLayer* layer) OVERRIDE;
+
+  void DidSelectPopupMenuItems(const std::vector<int>& selected_indices);
+  void DidCancelPopupMenu();

[jam, 2012/09/04 16:44:48]

nit: you have this twice now.. also, I think it's better to keep one ifdef right
beside the interface for the overridden methods, and another below for other
android-only methods. 

+#endif
+
   // Creates a new RenderView with the given route id.
   void CreateNewWindow(
       int route_id,
       const ViewHostMsg_CreateWindow_Params& params,
       SessionStorageNamespace* session_storage_namespace);
 
   // Creates a new RenderWidget with the given route id.  |popup_type| indicates
   // if this widget is a popup and what kind of popup it is (select, autofill).
   void CreateNewWidget(int route_id, WebKit::WebPopupType popup_type);
 
   // Creates a full screen RenderWidget.
   void CreateNewFullscreenWidget(int route_id);
 
 #if defined(OS_MACOSX)
   // Select popup menu related methods (for external popup menus).
   void DidSelectPopupMenuItem(int selected_index);
   void DidCancelPopupMenu();
 #endif
 
-#if defined(OS_ANDROID)
-  void DidSelectPopupMenuItems(const std::vector<int>& selected_indices);
-  void DidCancelPopupMenu();
-#endif
-
   // User rotated the screen. Calls the "onorientationchange" Javascript hook.
   void SendOrientationChangeEvent(int orientation);
 
   const std::string& frame_tree() const {
     return frame_tree_;
   }
 
   // Updates the frame tree for this RVH and sends an IPC down to the renderer
   // process to keep them in sync. For more details, see the comments on
   // ViewHostMsg_FrameTreeUpdated.
@@ skipping 263 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_