Enable JS compilation for temp_storage_shared_worker and heap_snapshot_worker

BUG=None
R=apavlov@chromium.org, pfeldman@chromium.org

Review URL: https://codereview.chromium.org/137103007

git-svn-id: svn://svn.chromium.org/blink/trunk@165409 bbb929c8-8fbe-4397-9dbb-9b2b20218538