Enable per thread heap for database thread

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 93 matching lines @@
     , m_disabledStaticPersistentsRegistration(0)
 #endif
     , m_allocatedObjectSize(0)
     , m_markedObjectSize(0)
     , m_reportedMemoryToV8(0)
 {
     ASSERT(checkThread());
     ASSERT(!**s_threadSpecific);
     **s_threadSpecific = this;
 
-    // TODO(keishi) Remove when per thread heap is ready.
-    CHECK(!m_perThreadHeapEnabled);
-
     if (m_perThreadHeapEnabled) {
         m_heap = new ThreadHeap();
     } else if (isMainThread()) {
         s_mainThreadStackStart = reinterpret_cast<uintptr_t>(m_startOfStack) - sizeof(void*);
         size_t underestimatedStackSize = StackFrameDepth::getUnderestimatedStackSize();
         if (underestimatedStackSize > sizeof(void*))
             s_mainThreadUnderestimatedStackSize = underestimatedStackSize - sizeof(void*);
         m_heap = new ThreadHeap();
     } else {
         m_heap = &ThreadState::mainThreadState()->heap();
@@ skipping 1396 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