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

third_party/WebKit/public/platform/modules/payments/payment_request.mojom

Index: third_party/WebKit/public/platform/modules/payments/payment_request.mojom
diff --git a/third_party/WebKit/public/platform/modules/payments/payment_request.mojom b/third_party/WebKit/public/platform/modules/payments/payment_request.mojom
index 161240fe9c55ad8b25bb6a9dea4e6a7d6201c14c..d9e4b1e4a05add2092835071aea792541ee448b7 100644
--- a/third_party/WebKit/public/platform/modules/payments/payment_request.mojom
+++ b/third_party/WebKit/public/platform/modules/payments/payment_request.mojom
@@ -61,6 +61,7 @@ struct PaymentResponse {
 
   PaymentAddress? shipping_address;
   string? shipping_option;
+  string? payer_name;
   string? payer_email;
   string? payer_phone;
 };
@@ -106,6 +107,7 @@ struct PaymentDetails {
 };
 
 struct PaymentOptions {
+  bool request_payer_name;
   bool request_payer_email;
   bool request_payer_phone;
   bool request_shipping;