[Sync] Add support for loading, updating and querying delete journals in

sync/syncable/invalid_directory_backing_store.h

 // Copyright (c) 2012 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 SYNC_SYNCABLE_INVALID_DIRECTORY_BACKING_STORE_H_
 #define SYNC_SYNCABLE_INVALID_DIRECTORY_BACKING_STORE_H_
 
 #include "sync/syncable/directory_backing_store.h"
 
 namespace syncer {
 namespace syncable {
 
 // A class used to test scenarios where loading a directory fails.
 class InvalidDirectoryBackingStore : public DirectoryBackingStore {
  public:
   InvalidDirectoryBackingStore();
   virtual ~InvalidDirectoryBackingStore();
   virtual DirOpenResult Load(
       MetahandlesIndex* entry_bucket,
+      IdsIndex* delete_journals,
       Directory::KernelLoadInfo* kernel_load_info) OVERRIDE;
  private:
   DISALLOW_COPY_AND_ASSIGN(InvalidDirectoryBackingStore);
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_INVALID_DIRECTORY_BACKING_STORE_H_