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This can happen when rotation animator sets the orientation after
animation is completed. We shouldn't save this anyway, as we changed
the semantics as follows:
a) A user/API driven rotation change in tablet mode should be treated
  as user locked rotation.
b) A user will not be able to change the orientation in tablet mode
  from settings.

BUG=734107
TEST=Manual + unit test

Review-Url: https://codereview.chromium.org/2951773002
Cr-Commit-Position: refs/heads/master@{#481027}