Shut down all threads before the main thread shuts down

third_party/WebKit/Source/platform/heap/ThreadState.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 187 matching lines @@
     RELEASE_ASSERT(m_threadStackSize > 4 * 0x1000);
     m_threadStackSize -= 4 * 0x1000;
     return m_threadStackSize;
 }
 #endif
 
 void ThreadState::attachMainThread()
 {
     RELEASE_ASSERT(!Heap::s_shutdownCalled);
     MutexLocker locker(threadAttachMutex());
-    ThreadState* state = new(s_mainThreadStateStorage) ThreadState();
+    ThreadState* state = new (s_mainThreadStateStorage) ThreadState();
     attachedThreads().add(state);
 }
 
 void ThreadState::detachMainThread()
 {
     // Enter a safe point before trying to acquire threadAttachMutex
     // to avoid dead lock if another thread is preparing for GC, has acquired
     // threadAttachMutex and waiting for other threads to pause or reach a
     // safepoint.
     ThreadState* state = mainThreadState();
+    ASSERT(state->checkThread());
 
     // 1. Finish sweeping.
     state->completeSweep();
     {
         SafePointAwareMutexLocker locker(threadAttachMutex(), BlinkGC::NoHeapPointersOnStack);
 
         // 2. Add the main thread's heap pages to the orphaned pool.
         state->cleanupPages();
 
         // 3. Detach the main thread.
@@ skipping 1310 matching lines @@
     threadDump->addScalar("dead_count", "objects", totalDeadCount);
     threadDump->addScalar("live_size", "bytes", totalLiveSize);
     threadDump->addScalar("dead_size", "bytes", totalDeadSize);
 
     WebMemoryAllocatorDump* heapsDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(heapsDumpName);
     WebMemoryAllocatorDump* classesDump = BlinkGCMemoryDumpProvider::instance()->createMemoryAllocatorDumpForCurrentGC(classesDumpName);
     BlinkGCMemoryDumpProvider::instance()->currentProcessMemoryDump()->addOwnershipEdge(classesDump->guid(), heapsDump->guid());
 }
 
 } // namespace blink