Not for review - Rebase of crrev.com/62833003

Source/platform/WebThreadSupportingGC.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/WebThreadSupportingGC.h"
+#include "WebThreadOwnPtr.h"
 
 namespace blink {
 
 PassOwnPtr<WebThreadSupportingGC> WebThreadSupportingGC::create(const char* name)
 {
     return adoptPtr(new WebThreadSupportingGC(name));
 }
 
 WebThreadSupportingGC::WebThreadSupportingGC(const char* name)
-    : m_thread(adoptPtr(blink::Platform::current()->createThread(name)))
+    : m_thread(new WebThreadOwnPtr(blink::Platform::current()->createThread(name)))
 {
 }
 
 WebThreadSupportingGC::~WebThreadSupportingGC()
 {
     if (ThreadState::current()) {
         // WebThread's destructor blocks until all the tasks are processed.
         ThreadState::SafePointScope scope(ThreadState::HeapPointersOnStack);
-        m_thread.clear();
+        m_thread->clear();
     }
 }
 
 void WebThreadSupportingGC::attachGC()
 {
     m_pendingGCRunner = adoptPtr(new PendingGCRunner);
     m_messageLoopInterruptor = adoptPtr(new MessageLoopInterruptor(&platformThread()));
     platformThread().addTaskObserver(m_pendingGCRunner.get());
     ThreadState::attach();
     ThreadState::current()->addInterruptor(m_messageLoopInterruptor.get());
 }
 
 void WebThreadSupportingGC::detachGC()
 {
     ThreadState::current()->removeInterruptor(m_messageLoopInterruptor.get());
     ThreadState::detach();
     platformThread().removeTaskObserver(m_pendingGCRunner.get());
     m_pendingGCRunner = nullptr;
     m_messageLoopInterruptor = nullptr;
 }
 
 } // namespace blink