Use enum for per thread heap enabled flag

third_party/WebKit/Source/core/html/parser/HTMLParserThread.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 71 matching lines @@
 
 HTMLParserThread* HTMLParserThread::shared()
 {
     return s_sharedThread;
 }
 
 void HTMLParserThread::postTask(std::unique_ptr<CrossThreadClosure> closure)
 {
     ASSERT(isMainThread());
     if (!m_thread) {
-        m_thread = WebThreadSupportingGC::create("HTMLParserThread");
+        m_thread = WebThreadSupportingGC::create("HTMLParserThread", BlinkGC::MainThreadHeapMode);
         postTask(crossThreadBind(&HTMLParserThread::setupHTMLParserThread, crossThreadUnretained(this)));
     }
 
     m_thread->postTask(BLINK_FROM_HERE, std::move(closure));
 }
 
 } // namespace blink