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Enabled by experiment until now. Have not heard many bugs. Time to
eanble by default for 74 (and remove the switch later).

Bug: 896022
Change-Id: I975f1f91c6c80404e6debc369b1a9ca9cdf45455
Reviewed-on: https://chromium-review.googlesource.com/c/1489106Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635719}