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

sync/protocol/proto_value_conversions_unittest.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/memory/scoped_ptr.h"
+#include "base/string_number_conversions.h"
+#include "base/time.h"
 #include "base/values.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/protocol/app_notification_specifics.pb.h"
 #include "sync/protocol/app_setting_specifics.pb.h"
 #include "sync/protocol/app_specifics.pb.h"
 #include "sync/protocol/autofill_specifics.pb.h"
 #include "sync/protocol/bookmark_specifics.pb.h"
 #include "sync/protocol/encryption.pb.h"
 #include "sync/protocol/extension_setting_specifics.pb.h"
 #include "sync/protocol/extension_specifics.pb.h"
@@ skipping 93 matching lines @@
 }
 
 TEST_F(ProtoValueConversionsTest, AutofillProfileSpecificsToValue) {
   TestSpecificsToValue(AutofillProfileSpecificsToValue);
 }
 
 TEST_F(ProtoValueConversionsTest, BookmarkSpecificsToValue) {
   TestSpecificsToValue(BookmarkSpecificsToValue);
 }
 
+TEST_F(ProtoValueConversionsTest, BookmarkSpecificsData) {
+  const base::Time creation_time(base::Time::Now());
+  sync_pb::BookmarkSpecifics specifics;
+  specifics.set_creation_time_us(creation_time.ToInternalValue());
+  scoped_ptr<DictionaryValue> value(BookmarkSpecificsToValue(specifics));
+  EXPECT_FALSE(value->empty());
+  std::string encoded_time;
+  EXPECT_TRUE(value->GetString("creation_time_us", &encoded_time));
+  EXPECT_EQ(base::Int64ToString(creation_time.ToInternalValue()), encoded_time);
+}
+
 TEST_F(ProtoValueConversionsTest, ExtensionSettingSpecificsToValue) {
   TestSpecificsToValue(ExtensionSettingSpecificsToValue);
 }
 
 TEST_F(ProtoValueConversionsTest, ExtensionSpecificsToValue) {
   TestSpecificsToValue(ExtensionSpecificsToValue);
 }
 
 TEST_F(ProtoValueConversionsTest, NigoriSpecificsToValue) {
   TestSpecificsToValue(NigoriSpecificsToValue);
@@ skipping 111 matching lines @@
 
   scoped_ptr<DictionaryValue> value_without_specifics(
       ClientToServerResponseToValue(message, false /* include_specifics */));
   EXPECT_FALSE(value_without_specifics->empty());
   EXPECT_FALSE(ValueHasSpecifics(*(value_without_specifics.get()),
                                  "get_updates.entries"));
 }
 
 }  // namespace
 }  // namespace syncer