Improve error message for PaymentRequest.abort().

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/payments/PaymentRequest.h"
 
 #include <stddef.h>
 #include <utility>
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
@@ skipping 1022 matching lines @@
   DCHECK(complete_resolver_);
   complete_resolver_->Resolve();
   ClearResolversAndCloseMojoConnection();
 }
 
 void PaymentRequest::OnAbort(bool aborted_successfully) {
   DCHECK(abort_resolver_);
   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();
 }
 
 void PaymentRequest::OnCanMakePayment(CanMakePaymentQueryResult result) {
   DCHECK(can_make_payment_resolver_);
 
   switch (result) {
     case CanMakePaymentQueryResult::CAN_MAKE_PAYMENT:
       can_make_payment_resolver_->Resolve(true);
@@ skipping 20 matching lines @@
   complete_resolver_.Clear();
   show_resolver_.Clear();
   abort_resolver_.Clear();
   can_make_payment_resolver_.Clear();
   if (client_binding_.is_bound())
     client_binding_.Close();
   payment_provider_.reset();
 }
 
 }  // namespace blink