Synchronize commits at end of JS task

third_party/WebKit/Source/modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.cpp

 // Copyright 2016 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 "modules/offscreencanvas2d/OffscreenCanvasRenderingContext2D.h"
 
 #include "bindings/modules/v8/OffscreenCanvasRenderingContext2DOrWebGLRenderingContextOrWebGL2RenderingContext.h"
 #include "core/frame/ImageBitmap.h"
 #include "core/frame/Settings.h"
 #include "core/workers/WorkerGlobalScope.h"
@@ skipping 87 matching lines @@
 
 bool OffscreenCanvasRenderingContext2D::hasImageBuffer() const {
   return !!m_imageBuffer;
 }
 
 void OffscreenCanvasRenderingContext2D::reset() {
   m_imageBuffer = nullptr;
   BaseRenderingContext2D::reset();
 }
 
+void OffscreenCanvasRenderingContext2D::finalizeFrame() {
+  DCHECK(offscreenCanvas());
+  offscreenCanvas()->doCommitAtEndOfTask();
+}
+
 ColorBehavior OffscreenCanvasRenderingContext2D::drawImageColorBehavior()
     const {
   return CanvasRenderingContext::colorBehaviorForMediaDrawnToCanvas();
 }
 
 ImageBuffer* OffscreenCanvasRenderingContext2D::imageBuffer() const {
   if (!m_imageBuffer) {
     IntSize surfaceSize(width(), height());
     OpacityMode opacityMode = hasAlpha() ? NonOpaque : Opaque;
     std::unique_ptr<ImageBufferSurface> surface;
@@ skipping 127 matching lines @@
 }
 
 bool OffscreenCanvasRenderingContext2D::isContextLost() const {
   return false;
 }
 
 bool OffscreenCanvasRenderingContext2D::isPaintable() const {
   return this->imageBuffer();
 }
 }