Invalidate background-attachment:fixed on scroll.

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.h

 /*
  * Copyright (C) 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 60 matching lines @@
 
     void updateAfterCompositingChangeIfNeeded();
 
     void updateHaveWheelEventHandlers();
     void updateHaveScrollEventHandlers();
 
     // Should be called whenever a scrollable area is added or removed, or gains/loses a composited layer.
     void scrollableAreasDidChange();
 
     // Should be called whenever the slow repaint objects counter changes between zero and one.
-    void frameViewHasSlowRepaintObjectsDidChange(FrameView*);
+    void frameViewHasBackgroundAttachmentFixedObjectsDidChange(FrameView*);
 
     // Should be called whenever the set of fixed objects changes.
     void frameViewFixedObjectsDidChange(FrameView*);
 
     // Should be called whenever the root layer for the given frame view changes.
     void frameViewRootLayerDidChange(FrameView*);
 
 #if OS(MACOSX)
     // Dispatched by the scrolling tree during handleWheelEvent. This is required as long as scrollbars are painted on the main thread.
     void handleWheelEventPhase(PlatformWheelEventPhase);
 #endif
 
     enum MainThreadScrollingReasonFlags {
-        HasSlowRepaintObjects = 1 << 0,
+        HasBackgroundAttachmentFixedObjects = 1 << 0,
         HasNonLayerViewportConstrainedObjects = 1 << 1,
         ThreadedScrollingDisabled = 1 << 2
     };
 
     MainThreadScrollingReasons mainThreadScrollingReasons() const;
     bool shouldUpdateScrollLayerPositionOnMainThread() const { return mainThreadScrollingReasons() != 0; }
 
     PassOwnPtr<WebScrollbarLayer> createSolidColorScrollbarLayer(ScrollbarOrientation, int thumbThickness, int trackStart, bool isLeftSideVerticalScrollbar);
 
     void willDestroyScrollableArea(ScrollableArea*);
@@ skipping 56 matching lines @@
     ScrollbarMap m_verticalScrollbars;
     HashSet<const PaintLayer*> m_layersWithTouchRects;
     bool m_wasFrameScrollable;
 
     MainThreadScrollingReasons m_lastMainThreadScrollingReasons;
 };
 
 } // namespace blink
 
 #endif // ScrollingCoordinator_h