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According to the finch results on M83 Stable and the discussion, all
launch blockers of this feature have been cleared.

This patch first enables it on trunk. A followup internal CL will enable
it in other channels via finch configurations.

Bug: 1040632
Change-Id: Icd9ab4a85c9d755072310c1be4fc4e524133d6f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296280Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789825}