If you're looking to Download AV Rules on your Chromebook laptop Then read the following guideline.

Simple, powerful rules to control your screen resolutions and audio output devices. When I connect my projector, I want my mac to switch to 1080p. When I connect my TV, I want it to run at 720p When hdmi audio output is available, I want my mac to use that (and to use all the channels too!) AV Rules makes it easy for me to set those rules. You can easily set the rules you need too!