Oilpan: Prepare to move AbstractSQLStatementBackend and SQLStatementBackend to Oilpan heap.

Source/modules/webdatabase/SQLTransactionBackend.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 355 matching lines @@
 }
 
 SQLTransactionBackend::~SQLTransactionBackend()
 {
     ASSERT(!m_sqliteTransaction);
 }
 
 void SQLTransactionBackend::trace(Visitor* visitor)
 {
     visitor->trace(m_frontend);
+    visitor->trace(m_currentStatementBackend);
     visitor->trace(m_database);
+    visitor->trace(m_statementQueue);
 }
 
 void SQLTransactionBackend::doCleanup()
 {
     if (!m_frontend)
         return;
     m_frontend = nullptr; // Break the reference cycle. See comment about the life-cycle above.
 
     ASSERT(database()->databaseContext()->databaseThread()->isDatabaseThread());
 
@@ skipping 72 matching lines @@
         &SQLTransactionBackend::sendToFrontendState,         // 11. deliverQuotaIncreaseCallback
         &SQLTransactionBackend::sendToFrontendState          // 12. deliverSuccessCallback
     };
 
     ASSERT(WTF_ARRAY_LENGTH(stateFunctions) == static_cast<int>(SQLTransactionState::NumberOfStates));
     ASSERT(state < SQLTransactionState::NumberOfStates);
 
     return stateFunctions[static_cast<int>(state)];
 }
 
-void SQLTransactionBackend::enqueueStatementBackend(PassRefPtr<SQLStatementBackend> statementBackend)
+void SQLTransactionBackend::enqueueStatementBackend(PassRefPtrWillBeRawPtr<SQLStatementBackend> statementBackend)
 {
     MutexLocker locker(m_statementMutex);
     m_statementQueue.append(statementBackend);
 }
 
 void SQLTransactionBackend::computeNextStateAndCleanupIfNeeded()
 {
     // Only honor the requested state transition if we're not supposed to be
     // cleaning up and shutting down:
     if (m_database->opened() && !m_database->isInterrupted()) {
@@ skipping 34 matching lines @@
 
 void SQLTransactionBackend::performNextStep()
 {
     computeNextStateAndCleanupIfNeeded();
     runStateMachine();
 }
 
 void SQLTransactionBackend::executeSQL(PassOwnPtr<AbstractSQLStatement> statement,
     const String& sqlStatement, const Vector<SQLValue>& arguments, int permissions)
 {
-    RefPtr<SQLStatementBackend> statementBackend;
-    statementBackend = SQLStatementBackend::create(statement, sqlStatement, arguments, permissions);
-    enqueueStatementBackend(statementBackend);
+    enqueueStatementBackend(SQLStatementBackend::create(statement, sqlStatement, arguments, permissions));
 }
 
 void SQLTransactionBackend::notifyDatabaseThreadIsShuttingDown()
 {
     ASSERT(database()->databaseContext()->databaseThread()->isDatabaseThread());
 
     // If the transaction is in progress, we should roll it back here, since this
     // is our last opportunity to do something related to this transaction on the
     // DB thread. Amongst other work, doCleanup() will clear m_sqliteTransaction
     // which invokes SQLiteTransaction's destructor, which will do the roll back
@@ skipping 281 matching lines @@
 }
 
 SQLTransactionState SQLTransactionBackend::sendToFrontendState()
 {
     ASSERT(m_nextState != SQLTransactionState::Idle);
     m_frontend->requestTransitToState(m_nextState);
     return SQLTransactionState::Idle;
 }
 
 } // namespace WebCore