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This allows devices to send Sharing messages via WebRTC if they are both
in the experiment. This allows us to control the rollout more controlled
and prevents devices not in the experiment to receive WebRTC messages.

Bug: 1021131
Change-Id: I25f137ed06075c8de7b1e9a5fbc48eb3b89219a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027794
Commit-Queue: Richard Knoll <knollr@chromium.org>
Reviewed-by: Himanshu Jaju <himanshujaju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737008}