Extension SW - add test for ServiceWorkerRegistration.sync.

content/public/test/background_sync_test_util.h

+// Copyright 2015 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 CONTENT_PUBLIC_TEST_BACKGROUND_SYNC_TEST_UTILS_H_
+#define CONTENT_PUBLIC_TEST_BACKGROUND_SYNC_TEST_UTILS_H_
+
+namespace content {
+
+class WebContents;
+
+// Utility class for background sync tests.
+class BackgroundSyncTestUtil {
+ public:
+  // Enable or disable notifications coming from the NetworkChangeNotifier. (For
+  // preventing flakes in tests)
+  static void SetIgnoreNetworkChangeNotifier(bool ignore);
+
+  // Puts background sync manager into online or offline mode for tests.
+  //
+  // This eventually (asynchronously) runs on the IO thread. However you can
+  // start performing background sync operation without waiting for the IO
+  // thread task to complete, since those background sync operations also run
+  // on the IO thread.
+  static void SetOnline(WebContents* web_contents, bool online);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_TEST_BACKGROUND_SYNC_TEST_UTILS_H_