Early terminate flings when scrolling impossible

content/renderer/input/input_handler_manager.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_H_
 #define CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/port/common/input_event_ack_state.h"
 #include "content/renderer/render_view_impl.h"
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace cc {
 class InputHandler;
-struct DidOverscrollParams;
 }
 
 namespace blink {
 class WebInputEvent;
 }
 
 namespace content {
 
 class InputHandlerWrapper;
 class InputHandlerManagerClient;
+struct DidOverscrollParams;
 
 // InputHandlerManager class manages InputHandlerProxy instances for
 // the WebViews in this renderer.
 class InputHandlerManager {
  public:
   // |message_loop_proxy| is the MessageLoopProxy of the compositor thread. Both
   // the underlying MessageLoop and supplied |client| must outlive this object.
   InputHandlerManager(
       const scoped_refptr<base::MessageLoopProxy>& message_loop_proxy,
       InputHandlerManagerClient* client);
   ~InputHandlerManager();
 
   // 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.
   InputEventAckState HandleInputEvent(int routing_id,
                                       const blink::WebInputEvent* input_event,
                                       ui::LatencyInfo* latency_info);
 
   // Called from the compositor's thread.
-  void DidOverscroll(int routing_id, const cc::DidOverscrollParams& params);
+  void DidOverscroll(int routing_id, const DidOverscrollParams& params);
 
   // Called from the compositor's thread.
   void DidStopFlinging(int routing_id);
 
  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 base::ScopedPtrHashMap<int,  // routing_id
                                  InputHandlerWrapper> InputHandlerMap;
   InputHandlerMap input_handlers_;
 
   scoped_refptr<base::MessageLoopProxy> message_loop_proxy_;
   InputHandlerManagerClient* client_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_INPUT_INPUT_HANDLER_MANAGER_H_