Snap items to right when layout is RTL

In RTL mode, GridLayoutManager was aligning children to the left although
it was ordering them properly (e.g. first child on right etc).

This CL fixes the bug and aligns children to right when RTL is true and
layout is vertical.

Bug: 19445130
Change-Id: If7a7bb39a3cae419ac348003e1e1dac6b213f11e
2 files changed