GitLab

https://chromium-review.googlesource.com/c/chromium/src/+/1351501 has
reverted some perf changes due to high-end mac laptops crashing. Re-add
that CL piece by piece. This CL adds no new tests, only the RAF
functionality.

Current canvas benchmarks only measure CPU time.
Using requestAnimationFrame (raf) in javascript we can
measure CPU + raster + GPU time. This CL adds a mode to
blink_perf.py that runs canvas all canvas test in a way
that takes raster and GPU time into account.

Roughly doubles the duration of `blink_perf.canvas`
benchmark from ~2 minutes to ~4 minutes on a linux desktop.

Bug: 894043
Change-Id: I50eeacbe47f3f3f0b09f1cb44806cabcad97dc2e
Reviewed-on: https://chromium-review.googlesource.com/c/1352475
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611518}