Implement the events for Background Fetch

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

Index: third_party/WebKit/Source/modules/background_fetch/BackgroundFetchedEvent.h
diff --git a/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchedEvent.h b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchedEvent.h
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index 0000000000000000000000000000000000000000..b06be3f75ea5dfe1b58cb6690b4b57c467bb04db
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+++ b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchedEvent.h
@@ -0,0 +1,42 @@
+// 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 BackgroundFetchedEvent_h
+#define BackgroundFetchedEvent_h
+
+#include "bindings/core/v8/ScriptPromise.h"
+#include "modules/background_fetch/BackgroundFetchEvent.h"
+#include "platform/heap/Handle.h"
+#include "wtf/text/AtomicString.h"
+
+namespace blink {
+
+class BackgroundFetchedEventInit;
+
+class BackgroundFetchedEvent final : public BackgroundFetchEvent {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  static BackgroundFetchedEvent* create(
+      const AtomicString& type,
+      const BackgroundFetchedEventInit& initializer) {
+    return new BackgroundFetchedEvent(type, initializer);
+  }
+
+  ~BackgroundFetchedEvent() override;
+
+  // Web Exposed method defined in the IDL file.
+  ScriptPromise updateUI(ScriptState*, String title);
+
+  // ExtendableEvent interface.
+  const AtomicString& interfaceName() const override;
+
+ private:
+  BackgroundFetchedEvent(const AtomicString& type,
+                         const BackgroundFetchedEventInit&);
+};
+
+}  // namespace blink
+
+#endif  // BackgroundFetchedEvent_h