Add totalAmount 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 5d6abfb53f716c75c2aabc2d424c9bb77918fe21..2b1eee8fc4367ec7b602242147cb8c9932b11b67 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentResponse.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentResponse.h
@@ -9,6 +9,7 @@
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/ModulesExport.h"
+#include "modules/payments/CurrencyAmount.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/payments/payment_request.mojom-blink.h"
 #include "wtf/Noncopyable.h"
@@ -30,6 +31,7 @@ public:
     virtual ~PaymentResponse();
 
     const String& methodName() const { return m_methodName; }
+    void totalAmount(CurrencyAmount& result) const { result = m_totalAmount; }
     ScriptValue details(ScriptState*, ExceptionState&) const;
     PaymentAddress* shippingAddress() const { return m_shippingAddress.get(); }
 
@@ -39,6 +41,7 @@ public:
 
 private:
     String m_methodName;
+    CurrencyAmount m_totalAmount;
     String m_stringifiedDetails;
     Member<PaymentAddress> m_shippingAddress;
     Member<PaymentCompleter> m_paymentCompleter;