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Also, enables Option-Up and Option-Down on the Mac.
R=sky@chromium.org, aleventhal@chromium.org, dmazzoni@chromium.org, pboss@chromium.org

Change-Id: I78b32b170e4600c14faf81fdfb1850bb0a720cd6
Bug: 908522
Reviewed-on: https://chromium-review.googlesource.com/c/1337819
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611312}