Improve metrics for display list canvas fallback reason

third_party/WebKit/Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 462 matching lines @@
 
 static PassRefPtr<Image> imageFromNode(const Node& node) {
   DCHECK(!node.document().needsLayoutTreeUpdate());
   DocumentLifecycle::DisallowTransitionScope disallowTransition(
       node.document().lifecycle());
 
   LayoutObject* layoutObject = node.layoutObject();
   if (!layoutObject)
     return nullptr;
 
-  if (layoutObject->isCanvas())
-    return toHTMLCanvasElement(node).copiedImage(FrontBuffer,
-                                                 PreferNoAcceleration);
+  if (layoutObject->isCanvas()) {
+    return toHTMLCanvasElement(node).copiedImage(
+        FrontBuffer, PreferNoAcceleration, SnapshotReasonCopyToClipboard);
+  }
 
   if (layoutObject->isImage()) {
     LayoutImage* layoutImage = toLayoutImage(layoutObject);
     if (!layoutImage)
       return nullptr;
 
     ImageResource* cachedImage = layoutImage->cachedImage();
     if (!cachedImage || cachedImage->errorOccurred())
       return nullptr;
     return cachedImage->getImage();
@@ skipping 1164 matching lines @@
 }
 
 DEFINE_TRACE(Editor) {
   visitor->trace(m_frame);
   visitor->trace(m_lastEditCommand);
   visitor->trace(m_undoStack);
   visitor->trace(m_mark);
 }
 
 }  // namespace blink