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This change modifieds the behavior of night_light_controller.cc to
selectively apply ambient color to only internal displays.

It also restructures night_light_controller_unittest.cc to allow for
multiple displays in AmbientEQTest.

The two tests affected by this change are also moved from
NightLightTest into AmbientEQTest.

Bug: 1078901
Change-Id: Ie967698d99713026591b44ddeaee294f80e2df60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453904
Commit-Queue: Nick Czajka <czajka@google.com>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816310}