[Sync] use base::Time in sync

chrome/browser/sync/syncable/syncable_columns.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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_SYNCABLE_SYNCABLE_COLUMNS_H_
 #define CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_COLUMNS_H_
 #pragma once
 
 #include "chrome/browser/sync/syncable/syncable.h"
 #include "chrome/browser/sync/syncable/syncable_changes_version.h"
 
 namespace syncable {
 
 struct ColumnSpec {
   const char* name;
   const char* spec;
 };
 
 // Must be in exact same order as fields in syncable.
 static const ColumnSpec g_metas_columns[] = {
   //////////////////////////////////////
   // int64s
   {"metahandle", "bigint primary key ON CONFLICT FAIL"},
   {"base_version", "bigint default " CHANGES_VERSION_STRING},
   {"server_version", "bigint default 0"},
-  // These timestamps are kept in native file timestamp format.  It is
-  // up to the syncer to translate to Java time when syncing.
+  {"server_position_in_parent", "bigint default 0"},
+  // This is the item ID that we store for the embedding application.
+  {"local_external_id", "bigint default 0"},
+  // These timestamps are kept in the same format as that of the
+  // protocol (ms since Unix epoch).
   {"mtime", "bigint default 0"},
   {"server_mtime", "bigint default 0"},
   {"ctime", "bigint default 0"},
   {"server_ctime", "bigint default 0"},
-  {"server_position_in_parent", "bigint default 0"},
-  // This is the item ID that we store for the embedding application.
-  {"local_external_id", "bigint default 0"},
   //////////////////////////////////////
   // Ids
   {"id", "varchar(255) default \"r\""},
   {"parent_id", "varchar(255) default \"r\""},
   {"server_parent_id", "varchar(255) default \"r\""},
   {"prev_id", "varchar(255) default \"r\""},
   {"next_id", "varchar(255) default \"r\""},
   //////////////////////////////////////
   // bits
   {"is_unsynced", "bit default 0"},
@@ skipping 19 matching lines @@
 COMPILE_ASSERT(arraysize(g_metas_columns) <= FIELD_COUNT, extra_column_names);
 
 static inline const char* ColumnName(int field) {
   DCHECK(field < BEGIN_TEMPS);
   return g_metas_columns[field].name;
 }
 
 }  // namespace syncable
 
 #endif  // CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_COLUMNS_H_