system_api: Add SetBacklightBrightnessRequest powerd proto. Add a SetBacklightBrightnessRequest protocol message that Chrome will send to powerd via SetScreenBrightnessPercent D-Bus method calls. These calls currently send raw D-Bus arguments, but a new "cause" argument is needed. Also add a new "MODEL" enum value to BacklightBrightnessChange's "cause" enum. BUG=chromium:881786 TEST=built it Change-Id: Ife2fc6741ece56620ced37feab8e33c093aeae0a Reviewed-on: https://chromium-review.googlesource.com/1237429 Commit-Ready: Dan Erat <derat@chromium.org> Tested-by: Dan Erat <derat@chromium.org> Reviewed-by: Jia Meng <jiameng@chromium.org> Reviewed-by: Dan Erat <derat@chromium.org>
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