publish canvas context API stat metrics

third_party/WebKit/Source/platform/graphics/RecordingImageBufferSurface.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "platform/graphics/RecordingImageBufferSurface.h"
 
+#include "platform/graphics/CanvasMetrics.h"
 #include "platform/graphics/ExpensiveCanvasHeuristicParameters.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "public/platform/Platform.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
@@ skipping 69 matching lines @@
     if (m_currentFrame) {
         RefPtr<SkPicture> currentPicture = adoptRef(m_currentFrame->endRecording());
         currentPicture->playback(m_fallbackSurface->canvas());
         m_currentFrame.clear();
     }
 
     if (m_imageBuffer) {
         m_imageBuffer->resetCanvas(m_fallbackSurface->canvas());
     }
 
+    CanvasMetrics::countCanvasContextUsage(CanvasMetrics::DisplayList2DCanvasFallbackToRaster);
 }
 
 PassRefPtr<SkImage> RecordingImageBufferSurface::newImageSnapshot(AccelerationHint hint)
 {
     if (!m_fallbackSurface)
         fallBackToRasterCanvas();
     return m_fallbackSurface->newImageSnapshot(hint);
 }
 
 SkCanvas* RecordingImageBufferSurface::canvas()
@@ skipping 162 matching lines @@
 
 void RecordingImageBufferSurface::setIsHidden(bool hidden)
 {
     if (m_fallbackSurface)
         m_fallbackSurface->setIsHidden(hidden);
     else
         ImageBufferSurface::setIsHidden(hidden);
 }
 
 } // namespace blink