Turn on profiling for our repository.query conduit call.

Summary:
This call times out a few times a week, and we're hoping that by
profiling it, we'll get some insight as to why.

Depends on D9969

Test Plan:
Ran
   ./update_phabricator_repositories.py -n /tmp
and then visited
   http://phabricator.khanacademy.org/xhprof/
and saw
    251 /api/repository.query
    Manual Run        Wed, Jun 11, 3:36 PM
    392,740 μs        PhabricatorConduitAPIController     ip-10-0-0-26
which was for my command I just ran.  Huzzah!

Reviewers: alpert

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D9970