indexeddb: make setVersion fire blocked event if other connections are open

chrome/renderer/indexed_db_dispatcher.h

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_RENDERER_INDEXED_DB_DISPATCHER_H_
 #define CHROME_RENDERER_INDEXED_DB_DISPATCHER_H_
 #pragma once
 
 #include "base/id_map.h"
 #include "base/nullable_string16.h"
@@ skipping 126 matching lines @@
   void OnSuccessNull(int32 response_id);
   void OnSuccessIDBDatabase(int32 response_id, int32 object_id);
   void OnSuccessIndexedDBKey(int32 response_id, const IndexedDBKey& key);
   void OnSuccessIDBObjectStore(int32 response_id, int32 object_id);
   void OnSuccessIDBTransaction(int32 response_id, int32 object_id);
   void OnSuccessIDBIndex(int32 response_id, int32 object_id);
   void OnSuccessOpenCursor(int32 response_id, int32 object_id);
   void OnSuccessSerializedScriptValue(int32 response_id,
                                       const SerializedScriptValue& value);
   void OnError(int32 response_id, int code, const string16& message);
+  void OnBlocked(int32 response_id);
   void OnAbort(int32 transaction_id);
   void OnComplete(int32 transaction_id);
   void OnTimeout(int32 transaction_id);
 
   // Careful! WebIDBCallbacks wraps non-threadsafe data types. It must be
   // destroyed and used on the same thread it was created on.
   IDMap<WebKit::WebIDBCallbacks, IDMapOwnPointer> pending_callbacks_;
   IDMap<WebKit::WebIDBTransactionCallbacks, IDMapOwnPointer>
       pending_transaction_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBDispatcher);
 };
 
 #endif  // CHROME_RENDERER_INDEXED_DB_DISPATCHER_H_