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This feature launched to 100% on windows, mac, and android in M80.  It
was just enabled by default on ChromeOS in ToT after an extended period
investigating performance regressions.

Bug: 960012
Change-Id: I6e1edacd5f3c180f64a024cb948022aeaf130d1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450495Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813905}