Make it clear what last_sync_timestamp actually tracks. Update

chrome/browser/sync/engine/syncer.h

 // Copyright (c) 2009 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_BROWSER_SYNC_ENGINE_SYNCER_H_
 #define CHROME_BROWSER_SYNC_ENGINE_SYNCER_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 29 matching lines @@
 struct HttpResponse;
 
 static const int kDefaultMaxCommitBatchSize = 25;
 
 enum SyncerStep {
   SYNCER_BEGIN,
   DOWNLOAD_UPDATES,
   PROCESS_CLIENT_COMMAND,
   VERIFY_UPDATES,
   PROCESS_UPDATES,
+  STORE_TIMESTAMPS,
   APPLY_UPDATES,
   BUILD_COMMIT_REQUEST,
   POST_COMMIT_MESSAGE,
   PROCESS_COMMIT_RESPONSE,
   BUILD_AND_PROCESS_CONFLICT_SETS,
   RESOLVE_CONFLICTS,
   APPLY_UPDATES_TO_RESOLVE_CONFLICTS,
   SYNCER_END
 };
 
@@ skipping 137 matching lines @@
   }
   return false;
 }
 // Utility function declarations.
 void CopyServerFields(syncable::Entry* src, syncable::MutableEntry* dest);
 void ClearServerData(syncable::MutableEntry* entry);
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCER_H_