R1:cd7fec1729fe

Implement very rough message context for Conpherence search

Summary: Ref T3165. This is pretty awful looking, but should pull the correct data.

Test Plan: {F387567}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T3165

Differential Revision: https://secure.phabricator.com/D12589