Delegate root layer scroll offset to android_webview.

content/renderer/gpu/input_handler_proxy.h

 // Copyright (c) 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_PROXY_H_
 #define CONTENT_RENDERER_GPU_INPUT_HANDLER_PROXY_H_
 
 #include "base/basictypes.h"
 #include "base/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/input/input_handler.h"
+#include "cc/input/layer_scroll_offset_delegate.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGestureCurve.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGestureCurveTarget.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebActiveWheelFlingParameters.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebInputEvent.h"
 
 namespace content {
 
 class InputHandlerProxyClient;
 
 // This class is a proxy between the content input event filtering and the
 // compositor's input handling logic. InputHandlerProxy instances live entirely
 // on the compositor thread. Each InputHandler instance handles input events
 // intended for a specific WebWidget.
 class CONTENT_EXPORT InputHandlerProxy
     : public cc::InputHandlerClient,
       public NON_EXPORTED_BASE(WebKit::WebGestureCurveTarget) {
  public:
   explicit InputHandlerProxy(cc::InputHandler* input_handler);
   virtual ~InputHandlerProxy();
 
   void SetClient(InputHandlerProxyClient* client);
+  void SetRootLayerScrollOffsetDelegate(
+      cc::LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate);
   void HandleInputEvent(const WebKit::WebInputEvent& event);
 
   // cc::InputHandlerClient implementation.
   virtual void WillShutdown() OVERRIDE;
   virtual void Animate(base::TimeTicks time) OVERRIDE;
   virtual void MainThreadHasStoppedFlinging() OVERRIDE;
   virtual void DidOverscroll(gfx::Vector2dF accumulated_overscroll,
                              gfx::Vector2dF current_fling_velocity) OVERRIDE;
 
   // WebKit::WebGestureCurveTarget implementation.
@@ skipping 41 matching lines @@
   // conservative in the sense that we might not be actually flinging when it is
   // true.
   bool fling_may_be_active_on_main_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(InputHandlerProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_INPUT_HANDLER_PROXY_H_