Focus first invalid field of payment request editor

chrome/browser/ui/views/payments/validating_combobox.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/validating_combobox.h"
 
 #include <utility>
 
 #include "ui/base/models/combobox_model.h"
 
@@ skipping 35 matching lines @@
 
   Validate();
 }
 
 void ValidatingCombobox::OnComboboxModelChanged(
     ui::ComboboxModel* unused_model) {
   ModelChanged();
   delegate_->ComboboxModelChanged(this);
 }
 
+bool ValidatingCombobox::IsValid() {
+  bool valid = delegate_->IsValidCombobox(this);
+  SetInvalid(!valid);
+  return valid;
+}
+
 void ValidatingCombobox::Validate() {
-  // ValidateCombobox may have side-effects, such as displaying errors.
-  SetInvalid(!delegate_->ValidateCombobox(this));
+  // ComboboxValueChanged may have side-effects, such as displaying errors.
+  SetInvalid(!delegate_->ComboboxValueChanged(this));
 }
 
 }  // namespace payments