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

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

Index: third_party/WebKit/Source/modules/payments/PaymentResponse.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentResponse.h b/third_party/WebKit/Source/modules/payments/PaymentResponse.h
index 1f9594ce4a9741d2053b13bee6455ac51d345b42..fc1b5d99402ffb7dd0a15a3488407f4997e92081 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentResponse.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentResponse.h
@@ -34,6 +34,7 @@ public:
     ScriptValue details(ScriptState*, ExceptionState&) const;
     PaymentAddress* shippingAddress() const { return m_shippingAddress.get(); }
     const String& shippingOption() const { return m_shippingOption; }
+    const String& payerName() const { return m_payerName; }
     const String& payerEmail() const { return m_payerEmail; }
     const String& payerPhone() const { return m_payerPhone; }
 
@@ -46,6 +47,7 @@ private:
     String m_stringifiedDetails;
     Member<PaymentAddress> m_shippingAddress;
     String m_shippingOption;
+    String m_payerName;
     String m_payerEmail;
     String m_payerPhone;
     Member<PaymentCompleter> m_paymentCompleter;