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

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

Bug: 889981
Change-Id: I2a4381b511c260a3845fbfd42a597cafe581fb43
Reviewed-on: https://chromium-review.googlesource.com/c/1250097
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600845}