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This turns motion stills back on. The feature is currently
considered ready to be enabled by default. A command line switch
can be added as a follow up if we determine that this is not
ready yet.

Bug: 769140
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I0e180cece59aed3356331be8609616ffaab0d35c
Reviewed-on: https://chromium-review.googlesource.com/749529Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513285}