Unable to Repro, holding until I can confirm this with sgabriel@

I'm able to repro, the steps are:

(1) Open full screen mode.
(2) Use v keyboard to enter a query that matches an app (like Chromium) for the first result.
(3) Hit enter, the app doesn't open.

If the first result is not an app and is a search, it works normally.

Happens with physical keyboard also.

I think this is an issue with partial focus. It works as intended with the feature flag disabled.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/57d461f80f1d36ca3c85a1da43ad8538c5e992cf

commit 57d461f80f1d36ca3c85a1da43ad8538c5e992cf
Author: hejq <hejq@chromium.org>
Date: Thu Jul 20 02:18:27 2017

Fix app list item indexing bug.

When the Play Store app search feature is enabled, we have
separators between items in the SearchResultTileItemListView.
We have to skip those separators while indexing items.

BUG= 739410 
BUG=739841

Review-Url: https://codereview.chromium.org/2972243002
Cr-Commit-Position: refs/heads/master@{#488098}

[modify] https://crrev.com/57d461f80f1d36ca3c85a1da43ad8538c5e992cf/ui/app_list/BUILD.gn
[modify] https://crrev.com/57d461f80f1d36ca3c85a1da43ad8538c5e992cf/ui/app_list/app_list_features.cc
[modify] https://crrev.com/57d461f80f1d36ca3c85a1da43ad8538c5e992cf/ui/app_list/app_list_features.h
[modify] https://crrev.com/57d461f80f1d36ca3c85a1da43ad8538c5e992cf/ui/app_list/test/app_list_test_view_delegate.h
[modify] https://crrev.com/57d461f80f1d36ca3c85a1da43ad8538c5e992cf/ui/app_list/views/search_result_answer_card_view_unittest.cc
[modify] https://crrev.com/57d461f80f1d36ca3c85a1da43ad8538c5e992cf/ui/app_list/views/search_result_list_view_unittest.cc
[modify] https://crrev.com/57d461f80f1d36ca3c85a1da43ad8538c5e992cf/ui/app_list/views/search_result_tile_item_list_view.cc
[add] https://crrev.com/57d461f80f1d36ca3c85a1da43ad8538c5e992cf/ui/app_list/views/search_result_tile_item_list_view_unittest.cc