Eliminate deferral overhead with canvas to canvas draws

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/ExpensiveCanvasHeuristicParameters.h"
 #include "platform/graphics/GraphicsContext.h"
@@ skipping 95 matching lines @@
 
 SkCanvas* RecordingImageBufferSurface::canvas()
 {
     if (m_fallbackSurface)
         return m_fallbackSurface->canvas();
 
     ASSERT(m_currentFrame->getRecordingCanvas());
     return m_currentFrame->getRecordingCanvas();
 }
 
-SkCanvas* RecordingImageBufferSurface::immediateCanvas()
+void RecordingImageBufferSurface::disableDeferral()
 {
     if (!m_fallbackSurface)
         fallBackToRasterCanvas();
-
-    return m_fallbackSurface->canvas();
 }
 
 PassRefPtr<SkPicture> RecordingImageBufferSurface::getPicture()
 {
     if (m_fallbackSurface)
         return nullptr;
 
     bool canUsePicture = finalizeFrameInternal();
     m_imageBuffer->didFinalizeFrame();
 
@@ skipping 149 matching lines @@
 
 void RecordingImageBufferSurface::setIsHidden(bool hidden)
 {
     if (m_fallbackSurface)
         m_fallbackSurface->setIsHidden(hidden);
     else
         ImageBufferSurface::setIsHidden(hidden);
 }
 
 } // namespace blink