Use Unthrottled instead of DOMManipulation in HTMLLinkElement/HTMLStyleElement

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2010 Apple Inc. All rights reserved.
  *           (C) 2007 Rob Buis (buis@kde.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 99 matching lines @@
   dispatchEvent(Event::create(m_loadedSheet ? EventTypeNames::load
                                             : EventTypeNames::error));
 }
 
 void HTMLStyleElement::notifyLoadedSheetAndAllCriticalSubresources(
     LoadedSheetErrorStatus errorStatus) {
   bool isLoadEvent = errorStatus == NoErrorLoadingSubresource;
   if (m_firedLoad && isLoadEvent)
     return;
   m_loadedSheet = isLoadEvent;
-  TaskRunnerHelper::get(TaskType::DOMManipulation, &document())
+  // TODO(hiroshige): Use DOMManipulation task runner. Unthrottled
+  // is temporarily used for fixing https://crbug.com/649942 only on M-56.
+  TaskRunnerHelper::get(TaskType::Unthrottled, &document())
       ->postTask(
           BLINK_FROM_HERE,
           WTF::bind(
               &HTMLStyleElement::dispatchPendingEvent, wrapPersistent(this),
               WTF::passed(IncrementLoadEventDelayCount::create(document()))));
   m_firedLoad = true;
 }
 
 bool HTMLStyleElement::disabled() const {
   if (!m_sheet)
     return false;
 
   return m_sheet->disabled();
 }
 
 void HTMLStyleElement::setDisabled(bool setDisabled) {
   if (CSSStyleSheet* styleSheet = sheet())
     styleSheet->setDisabled(setDisabled);
 }
 
 DEFINE_TRACE(HTMLStyleElement) {
   StyleElement::trace(visitor);
   HTMLElement::trace(visitor);
 }
 
 }  // namespace blink