Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/platform/testing/RunAllTests.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 50 matching lines @@
     WTF::setAlwaysZeroRandomSourceForTesting();
     WTF::initialize(CurrentTime, CurrentTime, nullptr);
     WTF::initializeMainThread(0);
 
     blink::TestingPlatformSupport::Config platformConfig;
     cc_blink::WebCompositorSupportImpl compositorSupport;
     platformConfig.compositorSupport = &compositorSupport;
     blink::TestingPlatformSupport platform(platformConfig);
 
     blink::Heap::init();
-    blink::ThreadState::attachMainThread();
+    blink::ThreadState::prepareForMainThread();
     blink::ThreadState::current()->registerTraceDOMWrappers(nullptr, nullptr);
     blink::EventTracer::initialize();
 
     blink::HTTPNames::init();
 
     base::TestSuite testSuite(argc, argv);
     int result = base::LaunchUnitTests(argc, argv, base::Bind(runTestSuite, base::Unretained(&testSuite)));
 
     blink::ThreadState::detachMainThread();
     blink::Heap::shutdown();
 
     WTF::shutdown();
     WTF::Partitions::shutdown();
     return result;
 }