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Plumb the frame rate of video updates to the display compositor. This
information is used to configure the display to tick at the video's
frame rate if possible.

R=liberato@chromium.org

Bug: 938106
Change-Id: Ic720900181f58eddf65069c3a6d4cc480a98efb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1556458
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Auto-Submit: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652902}