Refactor the Heap into ThreadHeap to prepare for per thread heaps

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

 /*
  * Copyright (C) 2007, 2008, 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
@@ skipping 28 matching lines @@
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 DatabaseThread::DatabaseThread()
     : m_transactionClient(adoptPtr(new SQLTransactionClient()))
     , m_transactionCoordinator(new SQLTransactionCoordinator())
     , m_cleanupSync(0)
     , m_terminationRequested(false)
 {
+    ASSERT(isMainThread());
 }
 
 DatabaseThread::~DatabaseThread()
 {
     ASSERT(m_openDatabaseSet.isEmpty());
     ASSERT(!m_thread);
 }
 
 DEFINE_TRACE(DatabaseThread)
 {
@@ skipping 95 matching lines @@
 
 void DatabaseThread::scheduleTask(PassOwnPtr<DatabaseTask> task)
 {
     ASSERT(m_thread);
     ASSERT(!terminationRequested());
     // WebThread takes ownership of the task.
     m_thread->postTask(BLINK_FROM_HERE, new Task(threadSafeBind(&DatabaseTask::run, task)));
 }
 
 } // namespace blink