Use TaskScheduler instead of WorkerPool in BackgroundTaskRunner.cpp

third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp

 /*
  * 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 234 matching lines @@
   }
   scheduleAsyncImageBitmapDecoding(arrayBuffer);
 }
 
 void ImageBitmapFactories::ImageBitmapLoader::didFail(FileError::ErrorCode) {
   rejectPromise();
 }
 
 void ImageBitmapFactories::ImageBitmapLoader::scheduleAsyncImageBitmapDecoding(
     DOMArrayBuffer* arrayBuffer) {
-  // For a 4000*4000 png image where each 10*10 tile is filled in by a random
-  // RGBA value, the byteLength is around 2M, and it typically takes around
-  // 4.5ms to decode on a current model of Linux desktop.
-  const int longTaskByteLengthThreshold = 2000000;
-  BackgroundTaskRunner::TaskSize taskSize =
-      BackgroundTaskRunner::TaskSizeShortRunningTask;
-  if (arrayBuffer->byteLength() >= longTaskByteLengthThreshold)
-    taskSize = BackgroundTaskRunner::TaskSizeLongRunningTask;
   RefPtr<WebTaskRunner> taskRunner =
       Platform::current()->currentThread()->getWebTaskRunner();
   BackgroundTaskRunner::postOnBackgroundThread(
       BLINK_FROM_HERE,
       crossThreadBind(
           &ImageBitmapFactories::ImageBitmapLoader::decodeImageOnDecoderThread,
           wrapCrossThreadPersistent(this), std::move(taskRunner),
           wrapCrossThreadPersistent(arrayBuffer), m_options.premultiplyAlpha(),
-          m_options.colorSpaceConversion()),
-      taskSize);
+          m_options.colorSpaceConversion()));
 }
 
 void ImageBitmapFactories::ImageBitmapLoader::decodeImageOnDecoderThread(
     RefPtr<WebTaskRunner> taskRunner,
     DOMArrayBuffer* arrayBuffer,
     const String& premultiplyAlphaOption,
     const String& colorSpaceConversionOption) {
   ASSERT(!isMainThread());
 
   ImageDecoder::AlphaOption alphaOp = ImageDecoder::AlphaPremultiplied;
@@ skipping 38 matching lines @@
   }
   m_factory->didFinishLoading(this);
 }
 
 DEFINE_TRACE(ImageBitmapFactories::ImageBitmapLoader) {
   visitor->trace(m_factory);
   visitor->trace(m_resolver);
 }
 
 }  // namespace blink