Selectively disable rubber banding on mac.

public/web/WebWidget.h

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 115 matching lines @@
     virtual void setCompositorSurfaceReady() { }
 
     // Called to inform the WebWidget of a change in theme.
     // Implementors that cache rendered copies of widgets need to re-render
     // on receiving this message
     virtual void themeChanged() { }
 
     // Called to inform the WebWidget of an input event. Returns true if
     // the event has been processed, false otherwise.
     virtual bool handleInputEvent(const WebInputEvent&) { return false; }
+    virtual bool handleInputEvent(const WebInputEvent&, bool can_rubberband_left, bool can_rubberband_right) { return false; }
 
     // Called to inform the WebWidget of the mouse cursor's visibility.
     virtual void setCursorVisibilityState(bool isVisible) { }
 
     // Check whether the given point hits any registered touch event handlers.
     virtual bool hasTouchEventHandlersAt(const WebPoint&) { return true; }
 
     // Applies a scroll delta to the root layer, which is bundled with a page
     // scale factor that may apply a CSS transform on the whole document (used
     // for mobile-device pinch zooming). This is triggered by events sent to the
@@ skipping 105 matching lines @@
     // content.
     virtual WebColor backgroundColor() const { return 0xFFFFFFFF; /* SK_ColorWHITE */ }
 
 protected:
     ~WebWidget() { }
 };
 
 } // namespace blink
 
 #endif