Design doc: goo.gl/dxkYDZ

Bug: v8:6624
Change-Id: I8813f79e415843ffe8d33a605a2662dbfc0c9764
Reviewed-on: https://chromium-review.googlesource.com/674883Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Michael Hablich <hablich@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48590}