Move sync performance tests into new target

chrome/test/live_sync/live_sync_timing_helper.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.
-
-#ifndef CHROME_TEST_LIVE_SYNC_LIVE_SYNC_TIMING_HELPER_H_
-#define CHROME_TEST_LIVE_SYNC_LIVE_SYNC_TIMING_HELPER_H_
-#pragma once
-
-#include "base/basictypes.h"
-
-#include <vector>
-
-namespace base {
-class TimeDelta;
-}
-
-class ProfileSyncServiceHarness;
-
-class LiveSyncTimingHelper {
- public:
-  LiveSyncTimingHelper();
-  ~LiveSyncTimingHelper();
-
-  // Returns the time taken for |client| to complete a single sync cycle.
-  static base::TimeDelta TimeSyncCycle(ProfileSyncServiceHarness* client);
-
-  // Returns the time taken for both |client| and |partner| to complete a sync
-  // cycle.
-  static base::TimeDelta TimeMutualSyncCycle(
-      ProfileSyncServiceHarness* client, ProfileSyncServiceHarness* partner);
-
-  // Returns the time taken for all clients in |clients| to complete their
-  // respective sync cycles.
-  static base::TimeDelta TimeUntilQuiescence(
-      std::vector<ProfileSyncServiceHarness*>& clients);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(LiveSyncTimingHelper);
-};
-
-#endif  // CHROME_TEST_LIVE_SYNC_LIVE_SYNC_TIMING_HELPER_H_