Oilpan: annotate weak ScrollableArea* refs with GC_PLUGIN_IGNORE()s.

third_party/WebKit/Source/platform/scroll/ScrollAnimatorBase.h

 /*
  * Copyright (c) 2010, 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 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ScrollAnimatorBase_h
 #define ScrollAnimatorBase_h
 
 #include "platform/PlatformExport.h"
 #include "platform/PlatformWheelEvent.h"
 #include "platform/geometry/FloatSize.h"
+#include "platform/heap/Handle.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "wtf/Forward.h"
 
 namespace blink {
 
 class FloatPoint;
 class ScrollableArea;
 class Scrollbar;
 
 class PLATFORM_EXPORT ScrollAnimatorBase {
@@ skipping 49 matching lines @@
     virtual bool shouldScrollbarParticipateInHitTesting(Scrollbar*) { return true; }
 
     virtual void notifyContentAreaScrolled(const FloatSize&) { }
 
     virtual bool setScrollbarsVisibleForTesting(bool) { return false; }
 protected:
     explicit ScrollAnimatorBase(ScrollableArea*);
 
     virtual void notifyPositionChanged();
 
+    GC_PLUGIN_IGNORE("509911")
     ScrollableArea* m_scrollableArea;
     float m_currentPosX; // We avoid using a FloatPoint in order to reduce
     float m_currentPosY; // subclass code complexity.
 
 private:
     float clampScrollPosition(ScrollbarOrientation, float);
 };
 
 } // namespace blink
 
 #endif // ScrollAnimatorBase_h