Revert 102184 - [Sync] use base::Time in sync

chrome/browser/sync/engine/syncer_util.h

 // 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.
 //
 // Utility functions manipulating syncable::Entries, intended for use by the
 // syncer.
 
 #ifndef CHROME_BROWSER_SYNC_ENGINE_SYNCER_UTIL_H_
 #define CHROME_BROWSER_SYNC_ENGINE_SYNCER_UTIL_H_
 #pragma once
 
 #include <set>
 #include <string>
 #include <vector>
 
+#include "build/build_config.h"
 #include "chrome/browser/sync/engine/syncer.h"
 #include "chrome/browser/sync/engine/syncer_types.h"
 #include "chrome/browser/sync/syncable/syncable.h"
 #include "chrome/browser/sync/syncable/syncable_id.h"
 
 namespace browser_sync {
 
 class Cryptographer;
 class SyncEntity;
 
@@ skipping 106 matching lines @@
 
   // Examine the up-to-date predecessors of this item according to the server
   // position, and then again according to the local position.  Return true
   // if they match.  For an up-to-date item, this should be the case.
   static bool ServerAndLocalOrdersMatch(syncable::Entry* entry);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(SyncerUtil);
 };
 
+#ifndef OS_WIN
+
+// time.h on Linux and Mac both return seconds since the epoch, this should
+// be converted to milliseconds.
+inline int64 ServerTimeToClientTime(int64 server_time) {
+  return server_time / GG_LONGLONG(1000);
+}
+
+inline int64 ClientTimeToServerTime(int64 client_time) {
+  return client_time * GG_LONGLONG(1000);
+}
+
+// As we truncate server times on the client for posix and on the server for
+// windows we need two ClientAndServerTimeMatch fucntions.
+inline bool ClientAndServerTimeMatch(int64 client_time, int64 server_time) {
+  // Compare at the coarser timescale (client)
+  return client_time == ServerTimeToClientTime(server_time);
+}
+#else
+// The sync server uses Java Times (ms since 1970)
+// and the client uses FILETIMEs (ns since 1601) so we need to convert
+// between the timescales.
+// TODO(sync): Fix this. No need to use two timescales.
+inline int64 ServerTimeToClientTime(int64 server_time) {
+  return server_time * GG_LONGLONG(10000) + GG_LONGLONG(116444736000000000);
+}
+
+inline int64 ClientTimeToServerTime(int64 client_time) {
+  return (client_time - GG_LONGLONG(116444736000000000)) / GG_LONGLONG(10000);
+}
+
+inline bool ClientAndServerTimeMatch(int64 client_time, int64 server_time) {
+  // Compare at the coarser timescale (server)
+  return ClientTimeToServerTime(client_time) == server_time;
+}
+#endif
+
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCER_UTIL_H_