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Mash implementation is a TODO.

Test: put in tablet mode, go to [1], press Lock in Current Orienation

[1] https://whatwebcando.today/screen-orientation.html

Bug: 889981
Change-Id: I19192a92ba927eba76c63089fa57c1288b34ff1c
Reviewed-on: https://chromium-review.googlesource.com/1252525
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595526}