R1:b8cb52a9daca

Return $this from shortcuts

Test Plan:
Search for `>setLineWidthFromChangesets(`.
Search for `>loadAndAttachAuxiliaryAttributes(`.

Reviewers: epriestley, jungejason

Reviewed By: jungejason

CC: aran

Differential Revision: https://secure.phabricator.com/D2102