Allow handling dblclick event
Allow handling dblclick event

Test Plan: See D3509.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3508

phacility/javelin,phacility/javelin,phacility/javelin,phacility/javelin,phacility/javelin