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Also added a helper api for setting the policy to integer.

Bug: 1131052, 1065522
Change-Id: I2c745f2e145c932fab21396afbd9e2689aba9d4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443635
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813952}