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The new method will offer a crude way to query about the power state of
connected HDMI CEC capable displays.

BUG=b:78171027

Change-Id: Ic37abea8f300d1d22a80368acbd3f129cc5e0187
Reviewed-on: https://chromium-review.googlesource.com/1042575Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Commit-Queue: Felix Ekblom <felixe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556727}