PaymentRequest: Add support for shipping type. (in blink side)

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

Index: third_party/WebKit/Source/modules/payments/PaymentRequest.idl
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequest.idl b/third_party/WebKit/Source/modules/payments/PaymentRequest.idl
index 5494a3b403c1eefe6bc906e9275bf2b27cb80c52..c320eb7fb6df2f2e63fdf4e08415b079c00be169 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.idl
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.idl
@@ -2,7 +2,7 @@
 // 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#paymentrequest-interface
+// https://w3c.github.io/browser-payment-api/#paymentrequest-interface
 // http://crbug.com/587995
 
 [
@@ -18,6 +18,7 @@
 
     [ImplementedAs=getShippingAddress] readonly attribute PaymentAddress? shippingAddress;
     readonly attribute DOMString? shippingOption;
+    readonly attribute PaymentShippingType? shippingType;
 
     attribute EventHandler onshippingaddresschange;
     attribute EventHandler onshippingoptionchange;