Fix WebView compositor input handling

content/renderer/gpu/input_handler_manager.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_RENDERER_GPU_INPUT_HANDLER_MANAGER_H_
 #define CONTENT_RENDERER_GPU_INPUT_HANDLER_MANAGER_H_
 
 #include <map>
 
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/renderer/render_view_impl.h"
-#include "ipc/ipc_channel_proxy.h"
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace cc {
 class InputHandler;
 }
 
 namespace WebKit {
 class WebInputEvent;
 }
 
 namespace content {
 
 class InputEventFilter;
 class InputHandlerWrapper;
+class InputHandlerManagerClient;
 
 // InputHandlerManager class manages InputHandlerProxy instances for
 // the WebViews in this renderer.
 class InputHandlerManager {
  public:
-  // |main_listener| refers to the central IPC message listener that lives on
-  // the main thread, where all incoming IPC messages are first handled.
   // |message_loop_proxy| is the MessageLoopProxy of the compositor thread.
   // The underlying MessageLoop must outlive this object.
   InputHandlerManager(
-      IPC::Listener* main_listener,
       const scoped_refptr<base::MessageLoopProxy>& message_loop_proxy);
   ~InputHandlerManager();
 
-  // This MessageFilter should be added to allow input events to be redirected
-  // to the compositor's thread.
-  IPC::ChannelProxy::MessageFilter* GetMessageFilter() const;
+  // Called from the main thread only.  Only one client can be bound to an
+  // InputHandlerManager, and the client must outlive this object.
+  void BindToClient(InputHandlerManagerClient* client);
+
+  // Called from the compositor's thread.
+  InputHandlerManagerClient* client() { return client_; }
 
   // Callable from the main thread only.
   void AddInputHandler(
       int routing_id,
       const base::WeakPtr<cc::InputHandler>& input_handler,
       const base::WeakPtr<RenderViewImpl>& render_view_impl);
 
   // Callback only from the compositor's thread.
   void RemoveInputHandler(int routing_id);
 
   // Called from the compositor's thread.
   void HandleInputEvent(int routing_id,
                         const WebKit::WebInputEvent* input_event);
 
-  // Called from the compositor's thread.
-  InputEventFilter* filter() { return filter_.get(); }
-
  private:
   // Called from the compositor's thread.
   void AddInputHandlerOnCompositorThread(
       int routing_id,
       const scoped_refptr<base::MessageLoopProxy>& main_loop,
       const base::WeakPtr<cc::InputHandler>& input_handler,
       const base::WeakPtr<RenderViewImpl>& render_view_impl);
 
   typedef std::map<int,  // routing_id
                    scoped_refptr<InputHandlerWrapper> > InputHandlerMap;
   InputHandlerMap input_handlers_;
 
   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
-  scoped_refptr<InputEventFilter> filter_;
+  InputHandlerManagerClient* client_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_INPUT_HANDLER_MANAGER_H_