UserAgent: Mozilla/5.0 (X11; CrOS x86_64 10452.85.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.158 Safari/537.36
Platform: 10452.85.0 (Official Build) stable-channel eve

Steps to reproduce the problem:
N/A

What is the expected behavior?
In the settings there will be a button to enable auto brightness to allow the screen brightness to be auto adjusted depending on the ambiance of the surrounding.

What went wrong?
No such setting or feature present

Did this work before? No 

Chrome version: 66.0.3359.158  Channel: stable
OS Version: 10452.85.0
Flash Version: 29.0.0.171