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Put all config requests into a vector and move them together.
Change the callbacks to handle all displays configured together rather than one display at a time.

BUG=1082882
TEST=no changes enabling and disabling displays, display_unittests.

Change-Id: I36859414e1e31e8411f67bac0c3609696cabeece
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2237653Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Mark Yacoub <markyacoub@google.com>
Auto-Submit: Mark Yacoub <markyacoub@google.com>
Cr-Commit-Position: refs/heads/master@{#789275}