PaymentRequest: Make the PaymentResponse interface serializable.

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

Index: third_party/WebKit/Source/modules/payments/PaymentAddress.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentAddress.h b/third_party/WebKit/Source/modules/payments/PaymentAddress.h
index c857e1b673abaee2285c13075b4c8a66669af131..444f490b4dcfdeb4352030b09ad451f0869780fe 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentAddress.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentAddress.h
@@ -5,6 +5,7 @@
 #ifndef PaymentAddress_h
 #define PaymentAddress_h
 
+#include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
@@ -23,6 +24,8 @@ public:
     explicit PaymentAddress(mojom::blink::PaymentAddressPtr);
     virtual ~PaymentAddress();
 
+    ScriptValue toJSONForBinding(ScriptState*) const;
+
     const String& country() const { return m_country; }
     const Vector<String>& addressLine() const { return m_addressLine; }
     const String& region() const { return m_region; }