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

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

Index: chrome/browser/ui/views/payments/contact_info_editor_view_controller.h
diff --git a/chrome/browser/ui/views/payments/contact_info_editor_view_controller.h b/chrome/browser/ui/views/payments/contact_info_editor_view_controller.h
index 3a94806673588b54a42895ba7836a6c15a3ebbf0..09649ce20b8a96e6aaec6a91c1422b0cbc027b38 100644
--- a/chrome/browser/ui/views/payments/contact_info_editor_view_controller.h
+++ b/chrome/browser/ui/views/payments/contact_info_editor_view_controller.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_CONTACT_INFO_EDITOR_VIEW_CONTROLLER_H_
 
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "base/macros.h"
@@ -27,11 +28,14 @@ class ContactInfoEditorViewController : public EditorViewController {
   ContactInfoEditorViewController(PaymentRequestSpec* spec,
                                   PaymentRequestState* state,
                                   PaymentRequestDialogView* dialog,
+                                  BackNavigationType back_navigation_type,
                                   autofill::AutofillProfile* profile);
   ~ContactInfoEditorViewController() override;
 
   // 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;