GitLab

Track the undrawn surfaces after aggregating all the surfaces for
display. This will be used to throttle begin-frames to undrawn
surfaces.

BUG=884876

Change-Id: I30fca08d4a8b5c773bc8f29111aad272032e14f9
Reviewed-on: https://chromium-review.googlesource.com/c/1315527Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604961}