Improve error message for PaymentRequest.abort().

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

Index: third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp b/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
index e517e71e3e26d6b59b090553dcefd9581db49931..993ba7cd967f4ba91b15c5f6f49d89edeb1403ea 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
@@ -1040,12 +1040,14 @@ void PaymentRequest::OnAbort(bool aborted_successfully) {
   DCHECK(show_resolver_);
 
   if (!aborted_successfully) {
-    abort_resolver_->Reject(DOMException::Create(kInvalidStateError));
+    abort_resolver_->Reject(DOMException::Create(
+        kInvalidStateError, "Unable to abort the payment"));
     abort_resolver_.Clear();
     return;
   }
 
-  show_resolver_->Reject(DOMException::Create(kAbortError));
+  show_resolver_->Reject(
+      DOMException::Create(kAbortError, "The website has aborted the payment"));
   abort_resolver_->Resolve();
   ClearResolversAndCloseMojoConnection();
 }