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This will allow us to skip restoring external display bounds when
heading to ACTIVE session, and instead restore on Display added during
a lock state.

Test: added test, manual
Bug: 1033263
Change-Id: I4bb91fc7db6f7423ce8280465e783cfc4f468dd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134570
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759876}