Add missing ui unit test targets to chromium_trybot.json.

BUG=365712
TEST=green trybots
R=phajdan.jr@chromium.org,sadrul@chromium.org

Review URL: https://codereview.chromium.org/246513003

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@265939 4ff67af0-8c30-449e-8e8b-ad334ec8d88c