PaymentRequest: Provide shippingAddress in PaymentResponse.

third_party/WebKit/Source/modules/payments/PaymentResponse.idl

 // 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.
 
 // https://w3c.github.io/browser-payment-api/specs/paymentrequest.html#paymentresponse-interface
 
 [
     RuntimeEnabled=PaymentRequest,
 ] interface PaymentResponse {
     readonly attribute DOMString methodName;
     [CallWith=ScriptState, RaisesException] readonly attribute object details;
+    readonly attribute PaymentAddress? shippingAddress;
 
     [CallWith=ScriptState] Promise<void> complete(boolean success);
 };