Add billing address as a mandatory field of Payments credit cards.

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 3a2f8a92d6ab449277be9adf6c0a9afb412e1768..74496ab849a05ecd7dbc5edd8b43edcdbcd1d056 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
@@ -36,6 +36,7 @@ class ShippingAddressEditorViewController : public EditorViewController {
       PaymentRequestSpec* spec,
       PaymentRequestState* state,
       PaymentRequestDialogView* dialog,
+      BackNavigationType back_navigation_type,
       base::OnceClosure on_edited,
       base::OnceCallback<void(const autofill::AutofillProfile&)> on_added,
       autofill::AutofillProfile* profile);
@@ -43,6 +44,7 @@ class ShippingAddressEditorViewController : public EditorViewController {
 
   // EditorViewController:
   std::unique_ptr<views::View> CreateHeaderView() override;
+  std::unique_ptr<views::View> CreateCustomFieldsView() override;
   std::vector<EditorField> GetFieldDefinitions() override;
   base::string16 GetInitialValueForType(
       autofill::ServerFieldType type) override;