Focus first invalid field of payment request editor

chrome/browser/ui/views/payments/credit_card_editor_view_controller.h

Index: chrome/browser/ui/views/payments/credit_card_editor_view_controller.h
diff --git a/chrome/browser/ui/views/payments/credit_card_editor_view_controller.h b/chrome/browser/ui/views/payments/credit_card_editor_view_controller.h
index dd69630db1eb6e967761916d548328c6c5e36593..96c08112ac0ede9d9b5aa96367e96d7cd69cb1d9 100644
--- a/chrome/browser/ui/views/payments/credit_card_editor_view_controller.h
+++ b/chrome/browser/ui/views/payments/credit_card_editor_view_controller.h
@@ -77,13 +77,18 @@ class CreditCardEditorViewController : public EditorViewController {
     ~CreditCardValidationDelegate() override;
 
     // ValidationDelegate:
-    bool ValidateTextfield(views::Textfield* textfield) override;
-    bool ValidateCombobox(views::Combobox* combobox) override;
+    bool IsValidTextfield(views::Textfield* textfield) override;
+    bool IsValidCombobox(views::Combobox* combobox) override;
+    bool TextfieldValueChanged(views::Textfield* textfield) override;
+    bool ComboboxValueChanged(views::Combobox* combobox) override;
     void ComboboxModelChanged(views::Combobox* combobox) override {}
 
    private:
-    // Validates a specific |value|.
-    bool ValidateValue(const base::string16& value);
+    // Validates a specific |value|/|combobox|.
+    bool ValidateValue(const base::string16& value,
+                       base::string16* error_message);
+    bool ValidateCombobox(views::Combobox* combobox,
+                          base::string16* error_message);
 
     EditorField field_;
     // Outlives this class.