Out of the box, we want Alt-Left to toggle Emojis, while Alt-Right
toggles the shifted symbols layout.

Bug: 23954008
Bug: 24369173

Change-Id: I93dd66fb469e5d0a831359ff3a786fe68e1d73ea
(cherry picked from commit 411841b374aa04e333ea5a438dfd539f49ec589a)