Improve metrics for display list canvas fallback reason

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

 /*
  * Copyright (C) 2004, 2006, 2007 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 1081 matching lines @@
     return;
   discardImageBuffer();
   OpacityMode opacityMode =
       m_context->creationAttributes().alpha() ? NonOpaque : Opaque;
   m_imageBuffer = ImageBuffer::create(size(), opacityMode);
   m_didFailToCreateImageBuffer = !m_imageBuffer;
 }
 
 PassRefPtr<Image> HTMLCanvasElement::copiedImage(
     SourceDrawingBuffer sourceBuffer,
-    AccelerationHint hint) const {
+    AccelerationHint hint,
+    SnapshotReason snapshotReason) const {
   if (!isPaintable())
     return nullptr;
   if (!m_context)
     return createTransparentImage(size());
 
   if (m_context->getContextType() ==
       CanvasRenderingContext::ContextImageBitmap) {
-    RefPtr<Image> image =
-        m_context->getImage(hint, SnapshotReasonGetCopiedImage);
+    RefPtr<Image> image = m_context->getImage(hint, snapshotReason);
     if (image)
-      return m_context->getImage(hint, SnapshotReasonGetCopiedImage);
+      return m_context->getImage(hint, snapshotReason);
     // Special case: transferFromImageBitmap is not yet called.
     sk_sp<SkSurface> surface =
         SkSurface::MakeRasterN32Premul(width(), height());
     return StaticBitmapImage::create(surface->makeImageSnapshot());
   }
 
   bool needToUpdate = !m_copiedImage;
   // The concept of SourceDrawingBuffer is valid on only WebGL.
   if (m_context->is3d())
     needToUpdate |= m_context->paintRenderingResultsToCanvas(sourceBuffer);
   if (needToUpdate && buffer()) {
-    m_copiedImage =
-        buffer()->newImageSnapshot(hint, SnapshotReasonGetCopiedImage);
+    m_copiedImage = buffer()->newImageSnapshot(hint, snapshotReason);
     updateExternallyAllocatedMemory();
   }
   return m_copiedImage;
 }
 
 void HTMLCanvasElement::discardImageBuffer() {
   m_imageBuffer.reset();
   m_dirtyRect = FloatRect();
   updateExternallyAllocatedMemory();
 }
@@ skipping 232 matching lines @@
   mojom::blink::OffscreenCanvasSurfacePtr service;
   Platform::current()->interfaceProvider()->getInterface(
       mojo::GetProxy(&service));
   m_surfaceLayerBridge =
       wrapUnique(new CanvasSurfaceLayerBridge(std::move(service)));
   return m_surfaceLayerBridge->createSurfaceLayer(this->width(),
                                                   this->height());
 }
 
 }  // namespace blink