[USS] Add function for update storage key for processor

components/sync/model_impl/processor_entity_tracker.cc

 // Copyright 2014 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.
 
 #include "components/sync/model_impl/processor_entity_tracker.h"
 
 #include "base/base64.h"
 #include "base/sha1.h"
 #include "base/trace_event/memory_usage_estimator.h"
 #include "components/sync/base/time.h"
@@ skipping 43 matching lines @@
     sync_pb::EntityMetadata* metadata)
     : storage_key_(storage_key),
       commit_requested_sequence_number_(metadata->acked_sequence_number()) {
   DCHECK(metadata->has_client_tag_hash());
   DCHECK(metadata->has_creation_time());
   metadata_.Swap(metadata);
 }
 
 ProcessorEntityTracker::~ProcessorEntityTracker() {}
 
+void ProcessorEntityTracker::SetStorageKey(const std::string& new_key) {
+  storage_key_ = new_key;
+}
+
 void ProcessorEntityTracker::SetCommitData(EntityData* data) {
   DCHECK(data);
   // Update data's fields from metadata.
   data->client_tag_hash = metadata_.client_tag_hash();
   if (!metadata_.server_id().empty())
     data->id = metadata_.server_id();
   data->creation_time = ProtoTimeToTime(metadata_.creation_time());
   data->modification_time = ProtoTimeToTime(metadata_.modification_time());
   DCHECK(MatchesSpecificsHash(data->specifics));
 
@@ skipping 187 matching lines @@
 void ProcessorEntityTracker::UpdateSpecificsHash(
     const sync_pb::EntitySpecifics& specifics) {
   if (specifics.ByteSize() > 0) {
     HashSpecifics(specifics, metadata_.mutable_specifics_hash());
   } else {
     metadata_.clear_specifics_hash();
   }
 }
 
 }  // namespace syncer