Warn web developer on missing favicon for PaymentRequest UI.

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 1038 matching lines @@
       break;
     case CanMakePaymentQueryResult::QUERY_QUOTA_EXCEEDED:
       can_make_payment_resolver_->Reject(DOMException::Create(
           kNotAllowedError, "Not allowed to check whether can make payment"));
       break;
   }
 
   can_make_payment_resolver_.Clear();
 }
 
+void PaymentRequest::WarnNoFavicon() {
+  GetExecutionContext()->AddConsoleMessage(
+      ConsoleMessage::Create(kJSMessageSource, kWarningMessageLevel,
+                             "Favicon not found for PaymentRequest UI. User "
+                             "may not recognize the website."));
+}
+
 void PaymentRequest::OnCompleteTimeout(TimerBase*) {
   GetExecutionContext()->AddConsoleMessage(ConsoleMessage::Create(
       kJSMessageSource, kErrorMessageLevel,
       "Timed out waiting for a PaymentResponse.complete() call."));
   payment_provider_->Complete(payments::mojom::blink::PaymentComplete(kFail));
   ClearResolversAndCloseMojoConnection();
 }
 
 void PaymentRequest::ClearResolversAndCloseMojoConnection() {
   complete_timer_.Stop();
   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