[Autofill] Handle the Tab Key in the new UI

chrome/browser/ui/autofill/autofill_popup_controller_impl.cc

Index: chrome/browser/ui/autofill/autofill_popup_controller_impl.cc
diff --git a/chrome/browser/ui/autofill/autofill_popup_controller_impl.cc b/chrome/browser/ui/autofill/autofill_popup_controller_impl.cc
index e310f8a1eb546f238146986b5f0bb387e4fe10c0..56aab618651941e61bd5b38b67cae1d0ede84912 100644
--- a/chrome/browser/ui/autofill/autofill_popup_controller_impl.cc
+++ b/chrome/browser/ui/autofill/autofill_popup_controller_impl.cc
@@ -213,6 +213,12 @@ bool AutofillPopupControllerImpl::HandleKeyPressEvent(
     case ui::VKEY_DELETE:
       return (event.modifiers & content::NativeWebKeyboardEvent::ShiftKey) &&
              RemoveSelectedLine();
+    case ui::VKEY_TAB:
+      // A tab press should cause the highlighted line to be selected, but still
+      // return false so the tab key press propagates and changes the cursor
+      // location.
+      AcceptSelectedLine();
+      return false;
     case ui::VKEY_RETURN:
       return AcceptSelectedLine();
     default: