Focus first invalid field of payment request editor

chrome/browser/ui/views/payments/validating_textfield.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_textfield.h"
 
 #include <utility>
 
 namespace payments {
 
@@ skipping 23 matching lines @@
 
 void ValidatingTextfield::OnContentsChanged() {
   // Validation on every keystroke only happens if the field has been validated
   // before as part of a blur.
   if (!was_blurred_)
     return;
 
   Validate();
 }
 
+bool ValidatingTextfield::IsValid() {
+  bool valid = delegate_->IsValidTextfield(this);
+  SetInvalid(!valid);
+  return valid;
+}
+
 void ValidatingTextfield::Validate() {
-  // ValidateTextfield may have side-effects, such as displaying errors.
-  SetInvalid(!delegate_->ValidateTextfield(this));
+  // TextfieldValueChanged may have side-effects, such as displaying errors.
+  SetInvalid(!delegate_->TextfieldValueChanged(this));
 }
 
 }  // namespace payments