Enable per thread heap on parser thread

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 66 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",
-                                             BlinkGC::MainThreadHeapMode);
+                                             BlinkGC::PerThreadHeapMode);
     postTask(crossThreadBind(&HTMLParserThread::setupHTMLParserThread,
                              crossThreadUnretained(this)));
   }
 
   m_thread->postTask(BLINK_FROM_HERE, std::move(closure));
 }
 
 }  // namespace blink