[Web Payments] Show a spinner after unmasking a card.

chrome/browser/ui/views/payments/cvc_unmask_view_controller.cc

 // Copyright 2017 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 "chrome/browser/ui/views/payments/cvc_unmask_view_controller.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autofill/risk_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
+#include "chrome/browser/ui/views/payments/payment_request_dialog_view.h"
 #include "chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h"
 #include "chrome/browser/ui/views/payments/payment_request_views_util.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/autofill/core/browser/credit_card.h"
 #include "components/autofill/core/browser/payments/full_card_request.h"
 #include "components/grit/components_scaled_resources.h"
 #include "components/payments/content/payment_request_state.h"
 #include "components/payments/core/payment_request_delegate.h"
 #include "components/signin/core/browser/profile_identity_provider.h"
 #include "components/signin/core/browser/signin_manager.h"
@@ skipping 164 matching lines @@
   }
 }
 
 void CvcUnmaskViewController::CvcConfirmed() {
   const base::string16& cvc = cvc_field_->text();
   if (unmask_delegate_) {
     autofill::CardUnmaskDelegate::UnmaskResponse response;
     response.cvc = cvc;
     unmask_delegate_->OnUnmaskResponse(response);
   }
+
+  dialog()->ShowProcessingSpinner();
 }
 
 }  // namespace payments