Add timeout expectations to some fast/js/regress tests.

Could be anything in the range 154246..154251. The big suspects,
154250 and 154249 are crash fixes and obtuse in the way they cause
this, so I felt expectations and a bug was the way to go.

TBR=acolwell@chromium.org
BUG=260744

Review URL: https://codereview.chromium.org/19372005

git-svn-id: svn://svn.chromium.org/blink/trunk@154307 bbb929c8-8fbe-4397-9dbb-9b2b20218538