Add the backchannel for Blobs to be received into Blink from the database backend.

Source/modules/indexeddb/IDBDatabase.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 96 matching lines @@
     bool containsObjectStore(const String& name) const
     {
         return findObjectStoreId(name) != IDBObjectStoreMetadata::InvalidId;
     }
 
     // Will return nullptr if this database is stopped.
     blink::WebIDBDatabase* backend() const { return m_backend.get(); }
 
     static int64_t nextTransactionId();
 
+    void ackReceivedBlobs(const Vector<blink::WebBlobInfo>*);
+
     static const char indexDeletedErrorMessage[];
     static const char isKeyCursorErrorMessage[];
     static const char noKeyOrKeyRangeErrorMessage[];
     static const char noSuchIndexErrorMessage[];
     static const char noSuchObjectStoreErrorMessage[];
     static const char noValueErrorMessage[];
     static const char notValidKeyErrorMessage[];
     static const char notVersionChangeTransactionErrorMessage[];
     static const char objectStoreDeletedErrorMessage[];
     static const char requestNotFinishedErrorMessage[];
@@ skipping 20 matching lines @@
     // Keep track of the versionchange events waiting to be fired on this
     // database so that we can cancel them if the database closes.
     WillBePersistentHeapVector<RefPtrWillBeMember<Event> > m_enqueuedEvents;
 
     RefPtr<IDBDatabaseCallbacks> m_databaseCallbacks;
 };
 
 } // namespace WebCore
 
 #endif // IDBDatabase_h