Add shippingOption to PaymentResponse

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 3631d5288f42f4edad29d9e4a7c4e28b4e1eca43..f41d5fa027898a838a83e21246cfd0a3d3ff5161 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentResponse.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentResponse.h
@@ -34,6 +34,7 @@ public:
     void totalAmount(PaymentCurrencyAmount& result) const { result = m_totalAmount; }
     ScriptValue details(ScriptState*, ExceptionState&) const;
     PaymentAddress* shippingAddress() const { return m_shippingAddress.get(); }
+    const String& shippingOption() const { return m_shippingOption; }
     const String& payerEmail() const { return m_payerEmail; }
     const String& payerPhone() const { return m_payerPhone; }
 
@@ -46,6 +47,7 @@ private:
     PaymentCurrencyAmount m_totalAmount;
     String m_stringifiedDetails;
     Member<PaymentAddress> m_shippingAddress;
+    String m_shippingOption;
     String m_payerEmail;
     String m_payerPhone;
     Member<PaymentCompleter> m_paymentCompleter;