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This needs to move to a shared location so that the same code can
be used by the Chromoting host.

Change-Id: If860352ef8583d47f268d5cb5b964e3c7f0a2f25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2141214Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757568}