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This CL adds a feature flag to toggle hardware key handling. This
is currently unused and disabled by default.

Bug: 902792
Change-Id: Ic1dfd70a81f6aa7abb8fd79b504b0d3bd05843e3
Reviewed-on: https://chromium-review.googlesource.com/c/1323798Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606207}