Adding new shipping address editor view to payment flow.

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

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PAYMENTS_EDITOR_VIEW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_EDITOR_VIEW_CONTROLLER_H_
 
 #include <map>
 #include <memory>
 #include <tuple>
@@ skipping 107 matching lines @@
   // |field| definition.
   virtual std::unique_ptr<ValidationDelegate> CreateValidationDelegate(
       const EditorField& field) = 0;
   virtual std::unique_ptr<ui::ComboboxModel> GetComboboxModelForType(
       const autofill::ServerFieldType& type) = 0;
 
   // PaymentRequestSheetController;
   std::unique_ptr<views::Button> CreatePrimaryButton() override;
   std::unique_ptr<views::View> CreateExtraFooterView() override;
 
+ protected:
+  // The editor content view, owned by the client so the derived classes can
+  // refresh it when some user interactions cause layout changes.
+  std::unique_ptr<views::View> editor_view_;
+
+  // Update the editor view by removing all it's child views and recreating
+  // the input fields returned by GetFieldDefinitions. Note that
+  // CreateEditorView MUST have been called at least once before calling
+  // UpdateEditorView.
+  virtual void UpdateEditorView();
+
+  // views::ComboboxListener:
+  void OnPerformAction(views::Combobox* combobox) override;
+
  private:
   // PaymentRequestSheetController:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   // views::TextfieldController:
   void ContentsChanged(views::Textfield* sender,
                        const base::string16& new_contents) override;
 
-  // views::ComboboxListener:
-  void OnPerformAction(views::Combobox* combobox) override;
-
   // Creates the whole editor view to go within the editor dialog. It
   // encompasses all the input fields created by CreateInputField().
-  std::unique_ptr<views::View> CreateEditorView();
+  void CreateEditorView();
 
   // Adds some views to |layout|, to represent an input field and its labels.
   // |field| is the field definition, which contains the label and the hint
   // about the length of the input field. A placeholder error label is also
   // added (see implementation).
   void CreateInputField(views::GridLayout* layout, const EditorField& field);
 
   // Used to remember the association between the input field UI element and the
   // original field definition. The ValidatingTextfield* and ValidatingCombobox*
   // are owned by their parent view, this only keeps a reference that is good as
   // long as the input field is visible.
   TextFieldsMap text_fields_;
   ComboboxMap comboboxes_;
   // Tracks the relationship between a field and its error label.
   ErrorLabelMap error_labels_;
 
   DISALLOW_COPY_AND_ASSIGN(EditorViewController);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_EDITOR_VIEW_CONTROLLER_H_