UserAgent: Mozilla/5.0 (X11; CrOS x86_64 11151.59.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.94 Safari/537.36

Steps to reproduce the problem:
1. looking
2. 
3. 

What is the expected behavior?
im supposed to be able to hook my HDMI cord from my chromebook to tv 

What went wrong?
there is no way to mirror the screen now

Did this work before? Yes 

Chrome version: 71.0.3578.94  Channel: n/a
OS Version: 11151.59.0
Flash Version: