PaymentApp: Blink side of payment request event dispatching in service worker.

third_party/WebKit/public/platform/modules/payments/WebPaymentCurrencyAmount.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 WebPaymentCurrencyAmount_h
+#define WebPaymentCurrencyAmount_h
+
+#include "public/platform/WebString.h"
+
+namespace blink {
+
+// https://w3c.github.io/browser-payment-api/#paymentcurrencyamount-dictionary
+struct WebPaymentCurrencyAmount {
+  WebString currency;
+  WebString value;
+  WebString currencySystem;
+};
+
+}  // namespace blink
+
+#endif  // WebPaymentCurrencyAmount_h