PaymentRequest: Add support for payerName. (in blink side)

third_party/WebKit/Source/modules/payments/PaymentOptions.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/#paymentoptions-dictionary
 
 enum PaymentShippingType {
     "shipping",
     "delivery",
     "pickup"
 };
 
 [
     RuntimeEnabled=PaymentRequest
 ] dictionary PaymentOptions {
+    [RuntimeEnabled=PaymentRequestPayerName] boolean requestPayerName = false;
     boolean requestPayerEmail = false;
     boolean requestPayerPhone = false;
     boolean requestShipping = false;
 
     // According to PaymentRequest constructor algorithm 22[1],
     // if options.shippingType is not a valid PaymentShippingType value then
     // set the shippingType attribute on request to 'shipping'.
     // On the other hand, according to webidl spec[2], it causes a TypeError
     // if passing a invalid enum value as operation argument. It means that the
     // constructor can stop due to a exception that occured in binding side.
     // In other words, the former is conflicting with the latter.
     // So, use DOMString instead of PaymentShippingType for now until this
     // spec issue is resolved. Please see: http://crbug.com/648052
     //
     // [1] https://w3c.github.io/browser-payment-api/#h-note5
     // [2] http://heycam.github.io/webidl/#example-363ff014
     DOMString shippingType = "shipping";
 };