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This CL adds a graph of the scanout time per seconds
reported in the PresentationFeedback.


Screenshot: https://screenshot.googleplex.com/7wZhCV78vtPskdu.png

Bug: 1075612
Change-Id: I16a5320532f35bdc3be4baa6e2bb59bd3db632b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463872
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820879}