Implement convertToBlob() in OffscreenCanvas

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 727 matching lines @@
     // ImageData allocation faillure
     TaskRunnerHelper::get(TaskType::CanvasBlobSerialization, &document())
         ->postTask(BLINK_FROM_HERE,
                    WTF::bind(&BlobCallback::handleEvent,
                              wrapPersistent(callback), nullptr));
     return;
   }
 
   CanvasAsyncBlobCreator* asyncCreator = CanvasAsyncBlobCreator::create(
       imageData->data(), encodingMimeType, imageData->size(), callback,
-      startTime, document());
+      startTime, &document(), nullptr);
 
-  bool useIdlePeriodScheduling = (encodingMimeType != "image/webp");
-  asyncCreator->scheduleAsyncBlobCreation(useIdlePeriodScheduling, quality);
+  asyncCreator->scheduleAsyncBlobCreation(quality);
 }
 
 void HTMLCanvasElement::addListener(CanvasDrawListener* listener) {
   m_listeners.add(listener);
 }
 
 void HTMLCanvasElement::removeListener(CanvasDrawListener* listener) {
   m_listeners.remove(listener);
 }
 
@@ skipping 583 matching lines @@
   mojom::blink::OffscreenCanvasSurfacePtr service;
   Platform::current()->interfaceProvider()->getInterface(
       mojo::GetProxy(&service));
   m_surfaceLayerBridge =
       wrapUnique(new CanvasSurfaceLayerBridge(std::move(service)));
   return m_surfaceLayerBridge->createSurfaceLayer(this->width(),
                                                   this->height());
 }
 
 }  // namespace blink