WTF: Implement explicit RefPtr::operator bool.

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h

 /*
  * Copyright (C) 2012 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:
  *
  * 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
@@ skipping 97 matching lines @@
     void setImageBuffer(ImageBuffer*);
     void didDraw(const FloatRect&);
     bool writePixels(const SkImageInfo&, const void* pixels, size_t rowBytes, int x, int y);
     void flush();
     void flushGpu();
     void prepareSurfaceForPaintingIfNeeded();
     bool isHidden() { return m_isHidden; }
 
     void beginDestruction();
     void hibernate();
-    bool isHibernating() const { return m_hibernationImage; }
+    bool isHibernating() const { return m_hibernationImage.get(); }
 
     PassRefPtr<SkImage> newImageSnapshot(AccelerationHint, SnapshotReason);
 
     // The values of the enum entries must not change because they are used for
     // usage metrics histograms. New values can be added to the end.
     enum HibernationEvent {
         HibernationScheduled = 0,
         HibernationAbortedDueToDestructionWhileHibernatePending = 1,
         HibernationAbortedDueToPendingDestruction = 2,
         HibernationAbortedDueToVisibilityChange = 3,
@@ skipping 145 matching lines @@
     // Each element in this vector represents an IOSurface backed texture that
     // is ready to be reused.
     // Elements in this vector can safely be purged in low memory conditions.
     Vector<ImageInfo> m_imageInfoCache;
 #endif // USE_IOSURFACE_FOR_2D_CANVAS
 };
 
 } // namespace blink
 
 #endif