PaymentApp: Add interfaces for PaymentRequestEvent.

third_party/WebKit/Source/modules/payments/PaymentRequestEvent.h

+// Copyright 2016 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 PaymentRequestEvent_h
+#define PaymentRequestEvent_h
+
+#include "modules/EventModules.h"
+#include "modules/payments/PaymentAppRequestData.h"
+#include "modules/serviceworkers/ExtendableEvent.h"
+#include "platform/heap/Handle.h"
+
+namespace WTF {
+class AtomicString;
+}  // namespace WTF

[please use gerrit instead, 2016/11/21 20:31:36]

Nit: Short blocks of forward declarations usually don't have "  // namespace
<name>" endings, because the reader can easily see the start of the namespace 2
lines above.

[zino, 2016/11/21 23:22:13]

Done.

+
+namespace blink {
+
+class MODULES_EXPORT PaymentRequestEvent final : public ExtendableEvent {
+  DEFINE_WRAPPERTYPEINFO();
+  WTF_MAKE_NONCOPYABLE(PaymentRequestEvent);
+
+ public:
+  const AtomicString& interfaceName() const override;
+
+  void data(PaymentAppRequestData&) const;
+  void respondWith(ScriptPromise);
+
+  DECLARE_VIRTUAL_TRACE();
+
+ private:
+  PaymentRequestEvent(const AtomicString& type,
+                      const PaymentAppRequestData&,
+                      WaitUntilObserver*);

[please use gerrit instead, 2016/11/21 20:31:36]

Please provide a destructor with "override" keyword.

[zino, 2016/11/21 23:22:13]

Done.

+};
+
+}  // namespace blink
+
+#endif  // PaymentRequestEvent_h