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Most (though not all) support for the "action" key is complete. Promote
it to Canary to enable easier testing for developers (so folks don't
have to build Chromium from scratch).

Bug: 893373
Change-Id: I671e87fbf55aa9f4e716e41277288261be7637b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2258575Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781549}