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Create a feature flag for this feature.

Bug: 751784
Change-Id: I49ba9af40f68496b1e59f3e5f9fc5e0fa068ae6f
Reviewed-on: https://chromium-review.googlesource.com/598628Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Sarah Chan <spqchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491746}