Timeout if website never completes the transaction.

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

Index: third_party/WebKit/Source/modules/payments/PaymentRequest.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequest.h b/third_party/WebKit/Source/modules/payments/PaymentRequest.h
index 178f05d6c98b1ebbb583ed41b0c6aa72f3d1c609..3290d3e2fd872d2fb6d19bc061d020ee6a6770c3 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.h
@@ -17,6 +17,7 @@
 #include "modules/payments/PaymentOptions.h"
 #include "modules/payments/PaymentUpdater.h"
 #include "mojo/public/cpp/bindings/binding.h"
+#include "platform/Timer.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/payments/payment_request.mojom-blink.h"
 #include "wtf/Compiler.h"
@@ -72,6 +73,8 @@ public:
 
     DECLARE_TRACE();
 
+    void onCompleteTimeoutForTesting();
+
 private:
     PaymentRequest(ScriptState*, const HeapVector<PaymentMethodData>&, const PaymentDetails&, const PaymentOptions&, ExceptionState&);
 
@@ -89,6 +92,8 @@ private:
     void OnComplete() override;
     void OnAbort(bool abortedSuccessfully) override;
 
+    void onCompleteTimeout(TimerBase*);
+
     // Clears the promise resolvers and closes the Mojo connection.
     void clearResolversAndCloseMojoConnection();
 
@@ -102,6 +107,7 @@ private:
     Member<ScriptPromiseResolver> m_abortResolver;
     mojom::blink::PaymentRequestPtr m_paymentProvider;
     mojo::Binding<mojom::blink::PaymentRequestClient> m_clientBinding;
+    Timer<PaymentRequest> m_completeTimer;
 };
 
 } // namespace blink