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This flag will be used for development / testing of the KeyboardLock
feature.  My plan is to have something available for testing (but
behind the flag) in M66.  We also plan to use this flag for rolling
out the change when it is ready for launch.

BUG=680809

Change-Id: I2e4f7ea16c458cab053a998ae1de4d9d7ab7fbec
Reviewed-on: https://chromium-review.googlesource.com/896022
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Gary Kacmarcik <garykac@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533750}