Add dataLoss property to IDB's upgradeneeded event

Source/modules/indexeddb/IDBCallbacks.h

 /*
  * Copyright (C) 2010 Google 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 47 matching lines @@
     virtual void onSuccess(int64_t value) = 0;
 
     // From IDBFactor.deleteDatabase(), IDBObjectStore/IDBIndex.get(), IDBObjectStore.delete(), IDBObjectStore.clear()
     virtual void onSuccess() = 0;
 
     // From IDBCursor.advance()/continue()
     virtual void onSuccess(PassRefPtr<IDBKey>, PassRefPtr<IDBKey> primaryKey, PassRefPtr<SharedBuffer>) = 0;
     // From IDBFactory.open()/deleteDatabase()
     virtual void onBlocked(int64_t /* existingVersion */) { ASSERT_NOT_REACHED(); }
     // From IDBFactory.open()
-    virtual void onUpgradeNeeded(int64_t /* oldVersion */, PassRefPtr<IDBDatabaseBackendInterface>, const IDBDatabaseMetadata&) { ASSERT_NOT_REACHED(); }
+    virtual void onUpgradeNeeded(int64_t /* oldVersion */, PassRefPtr<IDBDatabaseBackendInterface>, const IDBDatabaseMetadata&, bool dataLoss) { ASSERT_NOT_REACHED(); }
     virtual void onSuccess(PassRefPtr<IDBDatabaseBackendInterface>, const IDBDatabaseMetadata&) { ASSERT_NOT_REACHED(); }
 };
 
 } // namespace WebCore
 
 #endif // IDBCallbacks_h