[Payments] Add error messages to credit card 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 4ea2ef71990b2bf50ccd40f986b9e5916aa95b8e..a13067d9f47236e3e108433bebdb9e115126a947 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
@@ -28,14 +28,16 @@ class CreditCardEditorViewController : public EditorViewController {
   std::vector<EditorField> GetFieldDefinitions() override;
   bool ValidateModelAndSave() override;
   std::unique_ptr<ValidationDelegate> CreateValidationDelegate(
-      const EditorField& field) override;
+      const EditorField& field,
+      EditorViewController* controller) override;
   std::unique_ptr<ui::ComboboxModel> GetComboboxModelForType(
       const autofill::ServerFieldType& type) override;
 
  private:
   class CreditCardValidationDelegate : public ValidationDelegate {
    public:
-    explicit CreditCardValidationDelegate(const EditorField& field);
+    explicit CreditCardValidationDelegate(const EditorField& field,
+                                          EditorViewController* controller);
     ~CreditCardValidationDelegate() override;
 
     // ValidationDelegate:
@@ -47,6 +49,8 @@ class CreditCardEditorViewController : public EditorViewController {
     bool ValidateValue(const base::string16& value);
 
     EditorField field_;
+    // Outlives this class.
+    EditorViewController* controller_;
 
     DISALLOW_COPY_AND_ASSIGN(CreditCardValidationDelegate);
   };