Make OffscreenCanvas commit() propagate the origin-clean flag.

third_party/WebKit/Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 623 matching lines @@
   imageData = ImageData::create(m_size);
 
   if ((!m_context || !imageData) && !placeholderFrame())
     return imageData;
 
   DCHECK((m_context && m_context->is2d()) || placeholderFrame());
   sk_sp<SkImage> snapshot;
   if (hasImageBuffer()) {
     snapshot = buffer()->newSkImageSnapshot(PreferNoAcceleration, reason);
   } else if (placeholderFrame()) {
+    DCHECK(placeholderFrame()->originClean());
     // TODO(ccameron): Canvas should produce sRGB images.
     // https://crbug.com/672299
     snapshot = placeholderFrame()->imageForCurrentFrame(
         ColorBehavior::transformToGlobalTarget());
   }
 
   if (snapshot) {
     SkImageInfo imageInfo = SkImageInfo::Make(
         width(), height(), kRGBA_8888_SkColorType, kUnpremul_SkAlphaType);
     snapshot->readPixels(imageInfo, imageData->data()->data(),
@@ skipping 121 matching lines @@
 }
 
 SecurityOrigin* HTMLCanvasElement::getSecurityOrigin() const {
   return document().getSecurityOrigin();
 }
 
 bool HTMLCanvasElement::originClean() const {
   if (document().settings() &&
       document().settings()->disableReadingFromCanvas())
     return false;
+  if (placeholderFrame())
+    return placeholderFrame()->originClean();
   return m_originClean;
 }
 
 bool HTMLCanvasElement::shouldAccelerate(const IntSize& size) const {
   if (m_context && !m_context->is2d())
     return false;
 
   if (RuntimeEnabledFeatures::forceDisplayList2dCanvasEnabled())
     return false;
 
@@ skipping 603 matching lines @@
   mojom::blink::OffscreenCanvasSurfacePtr service;
   Platform::current()->interfaceProvider()->getInterface(
       mojo::GetProxy(&service));
   m_surfaceLayerBridge =
       WTF::wrapUnique(new CanvasSurfaceLayerBridge(std::move(service)));
   return m_surfaceLayerBridge->createSurfaceLayer(this->width(),
                                                   this->height());
 }
 
 }  // namespace blink