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If this flag is enabled, auto-brightness model will continue to adapt brightness
when ambient value changes, even after user changes brightness.

The flag is meant to remain disabled, and only enabled by developers for
experiments.

Bug: 881215
Change-Id: I8ee71a6f988554e0479f420b77996687fd32685c
Reviewed-on: https://chromium-review.googlesource.com/c/1353059Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Jia Meng <jiameng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611961}