Merge 120629 - [chromium/mac] Unbreak smooth scrolling.

Source/WebCore/platform/mac/ScrollAnimatorMac.mm

 /*
  * Copyright (C) 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
@@ skipping 573 matching lines @@
         [m_scrollbarPainterController.get() setDelegate:nil];
         [m_horizontalScrollbarPainterDelegate.get() invalidate];
         [m_verticalScrollbarPainterDelegate.get() invalidate];
         [m_scrollAnimationHelperDelegate.get() invalidate];
         END_BLOCK_OBJC_EXCEPTIONS;
     }
 }
 
 static bool scrollAnimationEnabledForSystem()
 {
-#if defined(BUILDING_ON_SNOW_LEOPARD) || defined(BUILDING_ON_LION)
+#if defined(BUILDING_ON_SNOW_LEOPARD) || defined(BUILDING_ON_LION) || PLATFORM(CHROMIUM)
     return [[NSUserDefaults standardUserDefaults] boolForKey:@"AppleScrollAnimationEnabled"];
 #else
     return [[NSUserDefaults standardUserDefaults] boolForKey:@"NSScrollAnimationEnabled"];
 #endif
 }
 
 bool ScrollAnimatorMac::scroll(ScrollbarOrientation orientation, ScrollGranularity granularity, float step, float multiplier)
 {
     m_haveScrolledSincePageLoad = true;
 
@@ skipping 589 matching lines @@
     if (rectInViewCoordinates == m_visibleScrollerThumbRect)
         return;
 
     m_scrollableArea->setVisibleScrollerThumbRect(rectInViewCoordinates);
     m_visibleScrollerThumbRect = rectInViewCoordinates;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(SMOOTH_SCROLLING)