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This change is intended to M-43. Currently screen rotation animations expose a bug, causing the login screen to not be useable.

Disable rotation animations while a user is not logged in. This will be later reverted on M-44 where a fix to the underlying issue will be landed.

TEST=manual testing on device
BUG=chrome-os-partner:40118

Review URL: https://codereview.chromium.org/1139793003

Cr-Commit-Position: refs/heads/master@{#330100}