Switch AutoscrollController to use animation system instead of timer

Source/core/page/AutoscrollController.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AutoscrollController_h
 #define AutoscrollController_h
 
-#include "platform/Timer.h"
 #include "platform/geometry/IntPoint.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 class EventHandler;
 class Frame;
 class FrameView;
 class Node;
+class Page;
 class PlatformMouseEvent;
 class RenderBox;
 class RenderObject;
 
 enum AutoscrollType {
     NoAutoscroll,
     AutoscrollForDragAndDrop,
     AutoscrollForSelection,
 #if OS(WIN)
     AutoscrollForPanCanStop,
     AutoscrollForPan,
 #endif
 };
 
 // AutscrollController handels autoscroll and pan scroll for EventHandler.
 class AutoscrollController {
 public:
+    static PassOwnPtr<AutoscrollController> create(Page&);
+
+    void animate(double monotonicFrameBeginTime);
     bool autoscrollInProgress() const;
     bool autoscrollInProgress(const RenderBox*) const;
-    static PassOwnPtr<AutoscrollController> create();
     bool panScrollInProgress() const;
     void startAutoscrollForSelection(RenderObject*);
-    void stopAutoscrollTimer();
+    void stopAutoscroll();
     void stopAutoscrollIfNeeded(RenderObject*);
     void updateAutoscrollRenderer();
     void updateDragAndDrop(Node* targetNode, const IntPoint& eventPosition, double eventTime);
 #if OS(WIN)
     void handleMouseReleaseForPanScrolling(Frame*, const PlatformMouseEvent&);
     void startPanScrolling(RenderBox*, const IntPoint&);
 #endif
 
 private:
-    AutoscrollController();
-    void autoscrollTimerFired(Timer<AutoscrollController>*);
-    void startAutoscrollTimer();
+    explicit AutoscrollController(Page&);
+
+    void startAutoscroll();
+
 #if OS(WIN)
-    void updatePanScrollState(FrameView*, const IntPoint&);
+    void updatePanScrollState(FrameView*, const IntPoint& lastKnownMousePosition);
 #endif
 
-    Timer<AutoscrollController> m_autoscrollTimer;
+    Page& m_page;
     RenderBox* m_autoscrollRenderer;
     AutoscrollType m_autoscrollType;
     IntPoint m_dragAndDropAutoscrollReferencePosition;
     double m_dragAndDropAutoscrollStartTime;
 #if OS(WIN)
     IntPoint m_panScrollStartPos;
 #endif
 };
 
 } // namespace WebCore
 
 #endif // AutoscrollController_h