Add support for fabs placed on the left half of the screen.

Authored by featherless on Wed, May 17, 4:07 PM.

Description

Add support for fabs placed on the left half of the screen.

Reviewers: O2 Material Motion, O4 Material Apple platform reviewers, Material Motion, markwei

Reviewed By: O2 Material Motion, O4 Material Apple platform reviewers, Material Motion, markwei

Tags: Material Motion

Differential Revision: http://codereview.cc/D3238