Early terminate flings when scrolling impossible

content/renderer/input/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_INPUT_INPUT_HANDLER_MANAGER_CLIENT_H_
 #define CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_CLIENT_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
 #include "ui/gfx/vector2d_f.h"
 
 namespace ui {
 struct LatencyInfo;
 }
 
 namespace cc {
 class InputHandler;
-struct DidOverscrollParams;
 }
 
 namespace blink {
 class WebInputEvent;
 }
 
 namespace content {
+struct DidOverscrollParams;
 
 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 blink::WebInputEvent*,
                          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,
                                   cc::InputHandler* input_handler) = 0;
   virtual void DidRemoveInputHandler(int routing_id) = 0;
   virtual void DidOverscroll(int routing_id,
-                             const cc::DidOverscrollParams& params) = 0;
+                             const DidOverscrollParams& params) = 0;
   virtual void DidStopFlinging(int routing_id) = 0;
 
  protected:
   InputHandlerManagerClient() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputHandlerManagerClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_INPUT_HANDLER_MANAGER_CLIENT_H_