UserAgent: Mozilla/5.0 (X11; CrOS x86_64 9901.77.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.97 Safari/537.36
Platform: Platform	9901.77.0 (Official Build) stable-channel edgar

Example URL:

Steps to reproduce the problem:
1. Play a video on you tube
2. Connect the HDMI port from chromwbook to TV
3. From setting select mirroring
4. The video from the chromebook is mirrored on TV with audio playing on TV
5. After 5-10 mins the video on TV goes black and only Audio is being played,
( The Home screen was being displayed on the chrombook )

What is the expected behavior?
The Audio and video should continue mirroring on TV from chromebook

What went wrong?
After 5-10 mins the video on TV goes black and only Audio is being played,
( The Home screen was being displayed on the chrombook )

Did this work before? N/A 

Is it a problem with Flash or HTML5? N/A

Does this work in other browsers? N/A

Chrome version: 62.0.3202.97  Channel: n/a
OS Version: 9901.77.0
Flash Version: 

Contents of chrome://gpu: