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This CL corresponds to phase 3.6 on the design document [1].

[1] https://docs.google.com/document/d/1AJKVA5U4nDkyDB9p4ROrggWXadCxyy-grKaE9KS5vOU/

BUG=787254
R=guidou@chromium.org, haraken@chromium.org

Change-Id: I9925a69727b19631188f21671ae41e12982c0517
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1792849
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695111}