Make stream captures work on canvases that are not in the DOM.

third_party/WebKit/Source/platform/graphics/Canvas2DImageBufferSurface.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 56 matching lines @@
                            bridge->opacityMode(),
                            bridge->colorSpace(),
                            bridge->colorType()),
         m_layerBridge(std::move(bridge)) {
     init();
   }
 
   ~Canvas2DImageBufferSurface() override { m_layerBridge->beginDestruction(); }
 
   // ImageBufferSurface implementation
-  void finalizeFrame(const FloatRect& dirtyRect) override {
-    m_layerBridge->finalizeFrame(dirtyRect);
+  void finalizeFrame() override { m_layerBridge->finalizeFrame(); }
+  void doPaintInvalidation(const FloatRect& dirtyRect) override {
+    m_layerBridge->doPaintInvalidation(dirtyRect);
   }
   void willOverwriteCanvas() override { m_layerBridge->willOverwriteCanvas(); }
   PaintCanvas* canvas() override { return m_layerBridge->canvas(); }
   void disableDeferral(DisableDeferralReason reason) override {
     m_layerBridge->disableDeferral(reason);
   }
   bool isValid() const override { return m_layerBridge->checkSurfaceValid(); }
   bool restore() override { return m_layerBridge->restoreSurface(); }
   WebLayer* layer() const override { return m_layerBridge->layer(); }
   bool isAccelerated() const override { return m_layerBridge->isAccelerated(); }
   void setFilterQuality(SkFilterQuality filterQuality) override {
     m_layerBridge->setFilterQuality(filterQuality);
   }
   void setIsHidden(bool hidden) override { m_layerBridge->setIsHidden(hidden); }
   void setImageBuffer(ImageBuffer* imageBuffer) override {
     m_layerBridge->setImageBuffer(imageBuffer);
   }
   void didDraw(const FloatRect& rect) override { m_layerBridge->didDraw(rect); }
   void flush(FlushReason) override { m_layerBridge->flush(); }
   void flushGpu(FlushReason) override { m_layerBridge->flushGpu(); }
-  void prepareSurfaceForPaintingIfNeeded() override {
-    m_layerBridge->prepareSurfaceForPaintingIfNeeded();
-  }
   bool writePixels(const SkImageInfo& origInfo,
                    const void* pixels,
                    size_t rowBytes,
                    int x,
                    int y) override {
     return m_layerBridge->writePixels(origInfo, pixels, rowBytes, x, y);
   }
 
   sk_sp<SkImage> newImageSnapshot(AccelerationHint hint,
                                   SnapshotReason reason) override {
     return m_layerBridge->newImageSnapshot(hint, reason);
   }
 
  private:
   void init() {
     clear();
     if (isValid())
       m_layerBridge->flush();
   }
 
   RefPtr<Canvas2DLayerBridge> m_layerBridge;
 };
 
 }  // namespace blink
 
 #endif