Create profile_sync_test_util in components

components/browser_sync/browser/profile_sync_test_util.h

+// Copyright 2016 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 COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_TEST_UTIL_H_
+#define COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_TEST_UTIL_H_
+
+#include "base/time/time.h"
+#include "components/sync_driver/sync_service_observer.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace base {
+class Time;
+class TimeDelta;
+}
+
+namespace browser_sync {
+
+// An empty syncer::NetworkTimeUpdateCallback. Used in various tests to
+// instantiate ProfileSyncService.
+void EmptyNetworkTimeUpdate(const base::Time&,
+                            const base::TimeDelta&,
+                            const base::TimeDelta&);
+
+class SyncServiceObserverMock : public sync_driver::SyncServiceObserver {
+ public:
+  SyncServiceObserverMock();
+  virtual ~SyncServiceObserverMock();
+
+  MOCK_METHOD0(OnStateChanged, void());
+};
+
+}  // namespace browser_sync
+
+#endif  // COMPONENTS_BROWSER_SYNC_BROWSER_PROFILE_SYNC_TEST_UTIL_H_