Provide getObjectOwnerPHID() on inline comment views
Summary:
This returns the PHID of the current revision owner, or the commit author, if one exists.
NOTE: For drafts, we currently return null; I'll fix that in a future change. Should be correct for submitted comments.
Test Plan: Added an inline, nothing seemed broken.
Reviewers: chad
Reviewed By: chad
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D12185