Merge "Update notification display buckets." into rvc-dev

    // See NotificationSectionsManager.PriorityBucket.

    enum NotificationSection {

        SECTION_UNKNOWN = 0;

        SECTION_PEOPLE = 1;

        SECTION_ALERTING = 2;

        SECTION_SILENT = 3;

        SECTION_HEADS_UP = 1;

        SECTION_PEOPLE = 2;

        SECTION_ALERTING = 3;

        SECTION_SILENT = 4;

    }

    optional NotificationSection section = 6;

}