Make it clear what last_sync_timestamp actually tracks. Update

chrome/chrome.gyp

 # Copyright (c) 2010 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.
 {
   'variables': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': 'tools/build/version.py',
       'version_path': 'VERSION',
@@ skipping 877 matching lines @@
         'browser/sync/engine/net/url_translator.cc',
         'browser/sync/engine/net/url_translator.h',
         'browser/sync/engine/post_commit_message_command.cc',
         'browser/sync/engine/post_commit_message_command.h',
         'browser/sync/engine/process_commit_response_command.cc',
         'browser/sync/engine/process_commit_response_command.h',
         'browser/sync/engine/process_updates_command.cc',
         'browser/sync/engine/process_updates_command.h',
         'browser/sync/engine/resolve_conflicts_command.cc',
         'browser/sync/engine/resolve_conflicts_command.h',
+        'browser/sync/engine/store_timestamps_command.cc',
+        'browser/sync/engine/store_timestamps_command.h',
         'browser/sync/engine/syncapi.h',
         'browser/sync/engine/syncer.cc',
         'browser/sync/engine/syncer.h',
         'browser/sync/engine/syncer_command.cc',
         'browser/sync/engine/syncer_command.h',
         'browser/sync/engine/syncer_end_command.cc',
         'browser/sync/engine/syncer_end_command.h',
         'browser/sync/engine/syncer_proto_util.cc',
         'browser/sync/engine/syncer_proto_util.h',
         'browser/sync/engine/syncer_thread.cc',
@@ skipping 711 matching lines @@
       }],  # targets
     }],  # OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris"
   ],  # 'conditions'
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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 # vim: set expandtab tabstop=2 shiftwidth=2: