[WebPayments] Making all fields and buttons focusable

chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc

Index: chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc
diff --git a/chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc b/chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc
index 0068ad31e81f79f8d18e854686b9fbab46418ec7..b69c0e3f5f66f9c6c0fc2104b1e7c0732863e5e8 100644
--- a/chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc
+++ b/chrome/browser/ui/views/payments/credit_card_editor_view_controller.cc
@@ -329,6 +329,7 @@ CreditCardEditorViewController::CreateExtraViewForField(
   add_button->set_id(
       static_cast<int>(DialogViewID::ADD_BILLING_ADDRESS_BUTTON));
   add_button->set_tag(add_billing_address_button_tag_);
+  add_button->SetFocusBehavior(views::View::FocusBehavior::ALWAYS);
   button_view->AddChildView(add_button.release());
   return button_view;
 }