Implement the events for Background Fetch

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

Index: third_party/WebKit/Source/modules/background_fetch/BackgroundFetchFailEvent.h
diff --git a/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchFailEvent.h b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchFailEvent.h
new file mode 100644
index 0000000000000000000000000000000000000000..ed8d3f1cbd307ee98f3ce05b01f6311c559b64ba
--- /dev/null
+++ b/third_party/WebKit/Source/modules/background_fetch/BackgroundFetchFailEvent.h
@@ -0,0 +1,38 @@
+// 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 BackgroundFetchFailEvent_h
+#define BackgroundFetchFailEvent_h
+
+#include "modules/background_fetch/BackgroundFetchEvent.h"
+#include "platform/heap/Handle.h"
+#include "wtf/text/AtomicString.h"
+
+namespace blink {
+
+class BackgroundFetchFailEventInit;
+
+class BackgroundFetchFailEvent final : public BackgroundFetchEvent {
+  DEFINE_WRAPPERTYPEINFO();
+
+ public:
+  static BackgroundFetchFailEvent* create(
+      const AtomicString& type,
+      const BackgroundFetchFailEventInit& initializer) {
+    return new BackgroundFetchFailEvent(type, initializer);
+  }
+
+  ~BackgroundFetchFailEvent() override;
+
+  // ExtendableEvent interface.
+  const AtomicString& interfaceName() const override;
+
+ private:
+  BackgroundFetchFailEvent(const AtomicString& type,
+                           const BackgroundFetchFailEventInit&);
+};
+
+}  // namespace blink
+
+#endif  // BackgroundFetchFailEvent_h