Change to idle-task implementations in toBlob

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 593 matching lines @@
     String encodingMimeType = toEncodingMimeType(mimeType);
 
     ImageData* imageData = toImageData(BackBuffer);
     // imageData unref its data, which we still keep alive for the async toBlob thread
     ScopedDisposal<ImageData> disposer(imageData);
     // Add a ref to keep image data alive until completion of encoding
     RefPtr<DOMUint8ClampedArray> imageDataRef(imageData->data());
 
     RefPtr<CanvasAsyncBlobCreator> asyncCreatorRef = CanvasAsyncBlobCreator::create(imageDataRef.release(), encodingMimeType, imageData->size(), callback, scriptState->executionContext());
 
-    asyncCreatorRef->scheduleAsyncBlobCreation(quality);
+    if (Platform::current()->isThreadedCompositingEnabled() && (encodingMimeType == DefaultMimeType)) {
+        asyncCreatorRef->scheduleAsyncBlobCreation(true);
+    } else {
+        asyncCreatorRef->scheduleAsyncBlobCreation(false, quality);
+    }
 }
 
 void HTMLCanvasElement::addListener(CanvasDrawListener* listener)
 {
     m_listeners.add(listener);
 }
 
 void HTMLCanvasElement::removeListener(CanvasDrawListener* listener)
 {
     m_listeners.remove(listener);
@@ skipping 387 matching lines @@
     }
     return ImageBitmapSource::fulfillImageBitmap(scriptState, isPaintable() ? ImageBitmap::create(this, IntRect(sx, sy, sw, sh), options) : nullptr);
 }
 
 bool HTMLCanvasElement::isOpaque() const
 {
     return m_context && !m_context->hasAlpha();
 }
 
 } // namespace blink