GTTF: enable new test launcher for ash_unittests, events_unittests, and keyboard_unittests

This is still behind --brave-new-test-launcher flag.

BUG=236893

Review URL: https://codereview.chromium.org/85503004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237287 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237287