Implement the events for Background Fetch

third_party/WebKit/Source/modules/background_fetch/ServiceWorkerGlobalScopeBackgroundFetch.h

Index: third_party/WebKit/Source/modules/background_fetch/ServiceWorkerGlobalScopeBackgroundFetch.h
diff --git a/third_party/WebKit/Source/modules/background_fetch/ServiceWorkerGlobalScopeBackgroundFetch.h b/third_party/WebKit/Source/modules/background_fetch/ServiceWorkerGlobalScopeBackgroundFetch.h
new file mode 100644
index 0000000000000000000000000000000000000000..29828589b4bb0cf78bb91a088e63c2ebf0a58288
--- /dev/null
+++ b/third_party/WebKit/Source/modules/background_fetch/ServiceWorkerGlobalScopeBackgroundFetch.h
@@ -0,0 +1,25 @@
+// Copyright 2017 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 ServiceWorkerGlobalScopeBackgroundFetch_h
+#define ServiceWorkerGlobalScopeBackgroundFetch_h
+
+#include "core/events/EventTarget.h"
+#include "wtf/Allocator.h"
+
+namespace blink {
+
+class ServiceWorkerGlobalScopeBackgroundFetch {
+  STATIC_ONLY(ServiceWorkerGlobalScopeBackgroundFetch);
+
+ public:
+  DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(backgroundfetched);
+  DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(backgroundfetchfail);
+  DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(backgroundfetchabort);
+  DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(backgroundfetchclick);
+};
+
+}  // namespace blink
+
+#endif  // ServiceWorkerGlobalScopeBackgroundFetch_h