Improve metrics for display list canvas fallback reason

third_party/WebKit/Source/core/html/HTMLCanvasElement.h

 /*
  * Copyright (C) 2004, 2006, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. 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.
@@ skipping 125 matching lines @@
   void paint(GraphicsContext&, const LayoutRect&);
 
   SkCanvas* drawingCanvas() const;
   void disableDeferral(DisableDeferralReason) const;
   SkCanvas* existingDrawingCanvas() const;
 
   CanvasRenderingContext* renderingContext() const { return m_context.get(); }
 
   void ensureUnacceleratedImageBuffer();
   ImageBuffer* buffer() const;
-  PassRefPtr<Image> copiedImage(SourceDrawingBuffer, AccelerationHint) const;
+  PassRefPtr<Image> copiedImage(SourceDrawingBuffer,
+                                AccelerationHint,
+                                SnapshotReason) const;
   void clearCopiedImage();
 
   SecurityOrigin* getSecurityOrigin() const;
   bool originClean() const;
   void setOriginTainted() { m_originClean = false; }
 
   AffineTransform baseTransform() const;
 
   bool is3D() const;
   bool isAnimated2D() const;
@@ skipping 147 matching lines @@
   // Used for OffscreenCanvas that controls this HTML canvas element
   std::unique_ptr<CanvasSurfaceLayerBridge> m_surfaceLayerBridge;
 
   int m_numFramesSinceLastRenderingModeSwitch;
   bool m_pendingRenderingModeSwitch;
 };
 
 }  // namespace blink
 
 #endif  // HTMLCanvasElement_h