[Payments] Added region load failure tolerance and tests to PR editor.

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

Index: chrome/browser/ui/views/payments/shipping_address_editor_view_controller.h
diff --git a/chrome/browser/ui/views/payments/shipping_address_editor_view_controller.h b/chrome/browser/ui/views/payments/shipping_address_editor_view_controller.h
index 61d2ee7fce73c81c7baf4e5d0c124a5b9763509b..cae3e188d0c75a78d29ebd7eea973466da8e8f6c 100644
--- a/chrome/browser/ui/views/payments/shipping_address_editor_view_controller.h
+++ b/chrome/browser/ui/views/payments/shipping_address_editor_view_controller.h
@@ -53,11 +53,13 @@ class ShippingAddressEditorViewController : public EditorViewController {
     // ValidationDelegate:
     bool ValidateTextfield(views::Textfield* textfield) override;
     bool ValidateCombobox(views::Combobox* combobox) override;
+    void ComboboxModelChanged(views::Combobox* combobox) override;
 
    private:
     bool ValidateValue(const base::string16& value);
 
     EditorField field_;
+
     // Raw pointer back to the owner of this class, therefore will not be null.
     ShippingAddressEditorViewController* controller_;
 
@@ -77,11 +79,18 @@ class ShippingAddressEditorViewController : public EditorViewController {
   // The list of country codes as ordered in the country combobox model.
   std::vector<std::string> country_codes_;
 
+  // Identifies whether we tried and failed to load region data.
+  bool failed_to_load_region_data_{false};
+
   // Updates |editor_fields_| based on the current country.
   void UpdateEditorFields();
 
-  // Called by the validation delegate when the country combobox changed.
-  void OnCountryChanged(views::Combobox* combobox);
+  // Called when data changes need to force a view update.
+  void OnDataChanged();
+
+  // When a combobox model has changed, a view update might be needed, e.g., if
+  // there is no data in the combox and it must be converted to a text field.

[Mathieu, 2017/04/05 00:25:14]

nit: combobox

[MAD, 2017/04/07 18:50:40]

Done.

+  void OnComboboxModelChanged(views::Combobox* combobox);
 
   DISALLOW_COPY_AND_ASSIGN(ShippingAddressEditorViewController);
 };