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This is phase 4 on the design document [1].

[1] https://docs.google.com/document/d/19Zk6Fv1E-6QTQ2c33rpBjDNEkzlsSKvjb3hWkvZAE80/

BUG=787252
R=guidou@chromium.org, haraken@chromium.org

Change-Id: If7d88ea6be23d46dd78a9c9bbdc564762ae86a80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2435922Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Antonio Gomes (GMT-4) <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#811342}