Refactor the Heap into ThreadHeap to prepare for per thread heaps

third_party/WebKit/Source/modules/webdatabase/Database.cpp

 /*
  * Copyright (C) 2013 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 196 matching lines @@
     , m_name(name.isolatedCopy())
     , m_expectedVersion(expectedVersion.isolatedCopy())
     , m_displayName(displayName.isolatedCopy())
     , m_estimatedSize(estimatedSize)
     , m_guid(0)
     , m_opened(false)
     , m_new(false)
     , m_transactionInProgress(false)
     , m_isTransactionQueueEnabled(true)
 {
+    ASSERT(isMainThread());
     m_contextThreadSecurityOrigin = m_databaseContext->securityOrigin()->isolatedCopy();
 
     m_databaseAuthorizer = DatabaseAuthorizer::create(infoTableName);
 
     if (m_name.isNull())
         m_name = "";
 
     {
         SafePointAwareMutexLocker locker(guidMutex());
         m_guid = guidForOriginAndName(securityOrigin()->toString(), name);
@@ skipping 669 matching lines @@
 SecurityOrigin* Database::securityOrigin() const
 {
     if (executionContext()->isContextThread())
         return m_contextThreadSecurityOrigin.get();
     if (databaseContext()->databaseThread()->isDatabaseThread())
         return m_databaseThreadSecurityOrigin.get();
     return 0;
 }
 
 } // namespace blink