Change overscroll functions to pass floats.

chrome/browser/ui/views/frame/scroll_end_effect_controller.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 CHROME_BROWSER_UI_VIEWS_FRAME_SCROLL_END_EFFECT_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_SCROLL_END_EFFECT_CONTROLLER_H_
 
 #include "base/basictypes.h"
 
 // The controller receives the raw y-deltas generated by the overscroll
 // controller and is resonsible for converting them in to the scroll end
 // effect. This effect occurs in the vertical overscroll case and is used to
 // visually indicate to the user that they have reached the end of the content
 // that they are scrolling.
 class ScrollEndEffectController {
  public:
   ScrollEndEffectController() {}
   virtual ~ScrollEndEffectController() {}
 
   static ScrollEndEffectController* Create();
 
   // Interface that allows vertical overscroll activies to be communicated to
   // the controller.
-  virtual void OverscrollUpdate(int delta_y) = 0;
+  virtual void OverscrollUpdate(float delta_y) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ScrollEndEffectController);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_SCROLL_END_EFFECT_CONTROLLER_H_