Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/web/WebKit.cpp

 /*
  * Copyright (C) 2009 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 153 matching lines @@
     s_webKitInitialized = true;
 
     WTF::Partitions::initialize(histogramEnumerationFunction);
     ASSERT(platform);
     Platform::initialize(platform);
 
     WTF::initialize(currentTimeFunction, monotonicallyIncreasingTimeFunction, adjustAmountOfExternalAllocatedMemory);
     WTF::initializeMainThread(callOnMainThreadFunction);
     Heap::init();
 
-    ThreadState::attachMainThread();
+    ThreadState::prepareForMainThread();

[haraken, 2016/01/28 15:52:50]

Nit: I'd prefer keeping "attach"/"attachMainThread" for consistency with
"detach".

[keishi, 2016/02/29 06:02:34]

Done.

     // currentThread() is null if we are running on a thread without a message loop.
     if (WebThread* currentThread = platform->currentThread()) {
         ASSERT(!s_gcTaskRunner);
         s_gcTaskRunner = new GCTaskRunner(currentThread);
     }
 
     DEFINE_STATIC_LOCAL(ModulesInitializer, initializer, ());
     initializer.init();
 
     setIndexedDBClientCreateFunction(IndexedDBClientImpl::create);
@@ skipping 118 matching lines @@
     ASSERT(!reloadPages);
     Page::refreshPlugins();
 }
 
 void decommitFreeableMemory()
 {
     WTF::Partitions::decommitFreeableMemory();
 }
 
 } // namespace blink