Use TaskScheduler instead of WorkerPool in BackgroundTaskRunner.cpp

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

Index: third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp
diff --git a/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp b/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp
index 25f506b83aa45128f1a8ae2b4f01aefd364e3036..6dda048f689db62de15707c978c224d1234adb48 100644
--- a/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp
+++ b/third_party/WebKit/Source/core/imagebitmap/ImageBitmapFactories.cpp
@@ -252,14 +252,6 @@ void ImageBitmapFactories::ImageBitmapLoader::didFail(FileError::ErrorCode) {
 
 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(
@@ -268,8 +260,7 @@ void ImageBitmapFactories::ImageBitmapLoader::scheduleAsyncImageBitmapDecoding(
           &ImageBitmapFactories::ImageBitmapLoader::decodeImageOnDecoderThread,
           wrapCrossThreadPersistent(this), std::move(taskRunner),
           wrapCrossThreadPersistent(arrayBuffer), m_options.premultiplyAlpha(),
-          m_options.colorSpaceConversion()),
-      taskSize);
+          m_options.colorSpaceConversion()));
 }
 
 void ImageBitmapFactories::ImageBitmapLoader::decodeImageOnDecoderThread(