Makes sync code persist the date the node was added. I'm hoping this covers

sync/protocol/proto_value_conversions.cc

 // 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.
 
 // Keep this file in sync with the .proto files in this directory.
 
 #include "sync/protocol/proto_value_conversions.h"
 
 #include "base/base64.h"
 #include "base/basictypes.h"
@@ skipping 253 matching lines @@
   SET_STR_REP(phone_home_whole_number);
   return value;
 }
 
 DictionaryValue* BookmarkSpecificsToValue(
     const sync_pb::BookmarkSpecifics& proto) {
   DictionaryValue* value = new DictionaryValue();
   SET_STR(url);
   SET_BYTES(favicon);
   SET_STR(title);
+  SET_INT64(creation_time_us);
   return value;
 }
 
 DictionaryValue* ExtensionSettingSpecificsToValue(
     const sync_pb::ExtensionSettingSpecifics& proto) {
   DictionaryValue* value = new DictionaryValue();
   SET_STR(extension_id);
   SET_STR(key);
   SET_STR(value);
   return value;
@@ skipping 311 matching lines @@
 #undef SET_BYTES
 #undef SET_INT32
 #undef SET_INT64
 #undef SET_INT64_REP
 #undef SET_STR
 #undef SET_STR_REP
 
 #undef SET_FIELD
 
 }  // namespace syncer