Selectively disable rubber banding on mac.

Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
@@ skipping 264 matching lines @@
     // right of the object. We keep track of these resizer areas for checking if touches
     // (implemented using Scroll gesture) are targeting the resizer.
     typedef HashSet<RenderBox*> ResizerAreaSet;
     void addResizerArea(RenderBox*);
     void removeResizerArea(RenderBox*);
     const ResizerAreaSet* resizerAreas() const { return m_resizerAreas.get(); }
 
     virtual void removeChild(Widget*) OVERRIDE;
 
     // This function exists for ports that need to handle wheel events manually.
     // On Mac WebKit1 the underlying NSScrollView just does the scrolling, but on most other platforms

[Nico, 2014/03/14 17:51:46]

(this comment can mostly go away)

[erikchen, 2014/03/20 18:04:26]

After following asvitkine's suggestion, I am no longer touching this file or
core/. I will not perform this clean-up in this change, unless you request
otherwise.

     // we need this function in order to do the scroll ourselves.
-    bool wheelEvent(const PlatformWheelEvent&);
+    bool wheelEvent(const PlatformWheelEvent&, bool canRubberbandLeft, bool canRubberbandRight);
 
     bool inProgrammaticScroll() const { return m_inProgrammaticScroll; }
     void setInProgrammaticScroll(bool programmaticScroll) { m_inProgrammaticScroll = programmaticScroll; }
 
     void setHasSoftwareFilters(bool hasSoftwareFilters) { m_hasSoftwareFilters = hasSoftwareFilters; }
     bool hasSoftwareFilters() const { return m_hasSoftwareFilters; }
 
     virtual bool isActive() const OVERRIDE;
 
     // DEPRECATED: Use viewportConstrainedVisibleContentRect() instead.
@@ skipping 249 matching lines @@
         m_view->setCanRepaintDuringPerformLayout(m_originalValue);
     }
 private:
     FrameView* m_view;
     bool m_originalValue;
 };
 
 } // namespace WebCore
 
 #endif // FrameView_h