Delegate root layer scroll offset to android_webview.

content/renderer/gpu/input_handler_manager_client.h

 // Copyright 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_RENDERER_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_
 #define CONTENT_RENDERER_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
 
 namespace ui {
 struct LatencyInfo;
 }
 
+namespace cc {
+class InputHandler;
+}
+
 namespace WebKit {
 class WebInputEvent;
 }
 
 namespace content {
 
 class CONTENT_EXPORT InputHandlerManagerClient {
  public:
   virtual ~InputHandlerManagerClient() {}
 
   // The Manager will supply a |handler| when bound to the client. This is valid
   // until the manager shuts down, at which point it supplies a null |handler|.
   // The client should only makes calls to |handler| on the compositor thread.
   typedef base::Callback<
       InputEventAckState(int /*routing_id*/,
                          const WebKit::WebInputEvent*,
                          const ui::LatencyInfo& latency_info)> Handler;
 
   // Called from the main thread.
   virtual void SetBoundHandler(const Handler& handler) = 0;
 
   // Called from the compositor thread.
-  virtual void DidAddInputHandler(int routing_id) = 0;
+  virtual void DidAddInputHandler(int routing_id,
+                                  cc::InputHandler* input_handler) = 0;
   virtual void DidRemoveInputHandler(int routing_id) = 0;
 
  protected:
   InputHandlerManagerClient() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputHandlerManagerClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_