GitLab

Also modifies callback to take a `Measurement` struct, since the number
of reported values was getting large.

Last, adds explicit calls to the roughness reporter from the submitter
when we stop rendering, so that it knows to stop the window.

Change-Id: Idb00046511c5cee0c351172ec6e786d35e870457
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410963Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810946}