Refactor the Heap into ThreadHeap to prepare for per thread heaps

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

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 29 matching lines @@
 static String getDatabaseIdentifier(SQLTransactionBackend* transaction)
 {
     Database* database = transaction->database();
     ASSERT(database);
     return database->stringIdentifier();
 }
 
 SQLTransactionCoordinator::SQLTransactionCoordinator()
     : m_isShuttingDown(false)
 {
+    ASSERT(isMainThread());
 }
 
 DEFINE_TRACE(SQLTransactionCoordinator)
 {
     visitor->trace(m_coordinationInfoMap);
 }
 
 void SQLTransactionCoordinator::processPendingTransactions(CoordinationInfo& info)
 {
     if (info.activeWriteTransaction || info.pendingTransactions.isEmpty())
@@ skipping 85 matching lines @@
             SQLTransactionBackend* transaction = info.pendingTransactions.takeFirst();
             transaction->notifyDatabaseThreadIsShuttingDown();
         }
     }
 
     // Clean up all pending transactions for all databases
     m_coordinationInfoMap.clear();
 }
 
 } // namespace blink