Eliminate deferral overhead with canvas to canvas draws

Source/platform/graphics/RecordingImageBufferSurface.h

 // 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.
 
 #ifndef RecordingImageBufferSurface_h
 #define RecordingImageBufferSurface_h
 
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/ImageBufferSurface.h"
 #include "public/platform/WebThread.h"
@@ skipping 17 matching lines @@
 };
 
 class PLATFORM_EXPORT RecordingImageBufferSurface : public ImageBufferSurface {
     WTF_MAKE_NONCOPYABLE(RecordingImageBufferSurface); WTF_MAKE_FAST_ALLOCATED(RecordingImageBufferSurface);
 public:
     RecordingImageBufferSurface(const IntSize&, PassOwnPtr<RecordingImageBufferFallbackSurfaceFactory> fallbackFactory, OpacityMode = NonOpaque);
     ~RecordingImageBufferSurface() override;
 
     // Implementation of ImageBufferSurface interfaces
     SkCanvas* canvas() override;
-    SkCanvas* immediateCanvas() override;
+    void disableDeferral() override;
     PassRefPtr<SkPicture> getPicture() override;
     void flush() override;
     void didDraw(const FloatRect&) override;
     bool isValid() const override { return true; }
     bool isRecording() const override { return !m_fallbackSurface; }
     bool writePixels(const SkImageInfo& origInfo, const void* pixels, size_t rowBytes, int x, int y) override;
     void willOverwriteCanvas() override;
     virtual void finalizeFrame(const FloatRect&);
     void setImageBuffer(ImageBuffer*) override;
     PassRefPtr<SkImage> newImageSnapshot() override;
@@ skipping 25 matching lines @@
     bool m_frameWasCleared;
     bool m_didRecordDrawCommandsInCurrentFrame;
     bool m_currentFrameHasExpensiveOp;
     bool m_previousFrameHasExpensiveOp;
     OwnPtr<RecordingImageBufferFallbackSurfaceFactory> m_fallbackFactory;
 };
 
 } // namespace blink
 
 #endif