Implement the events for Background Fetch

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

Index: third_party/WebKit/Source/modules/background_fetch/BackgroundFetchClickEvent.h
diff --git a/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchClickEvent.h b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchClickEvent.h
new file mode 100644
index 0000000000000000000000000000000000000000..054e9ea0cf42dfe950498d5db25c749f3285c3f3
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+++ b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchClickEvent.h
@@ -0,0 +1,43 @@
+// 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 BackgroundFetchClickEvent_h
+#define BackgroundFetchClickEvent_h
+
+#include "modules/background_fetch/BackgroundFetchEvent.h"
+#include "platform/heap/Handle.h"
+#include "wtf/text/AtomicString.h"
+
+namespace blink {
+
+class BackgroundFetchClickEventInit;
+
+class BackgroundFetchClickEvent final : public BackgroundFetchEvent {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  static BackgroundFetchClickEvent* create(
+      const AtomicString& type,
+      const BackgroundFetchClickEventInit& initializer) {
+    return new BackgroundFetchClickEvent(type, initializer);
+  }
+
+  ~BackgroundFetchClickEvent() override;
+
+  // Web Exposed attribute defined in the IDL file.
+  String state() const;
+
+  // ExtendableEvent interface.
+  const AtomicString& interfaceName() const override;
+
+ private:
+  BackgroundFetchClickEvent(const AtomicString& type,
+                            const BackgroundFetchClickEventInit&);
+
+  String m_state;
+};
+
+}  // namespace blink
+
+#endif  // BackgroundFetchClickEvent_h