UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.39 Safari/537.36

Steps to reproduce the problem:
0. Use headless Chrome
1. Render a page and take screenshot having only the laptop active
2. Render the same page and take screenshot while having an external monitor as primary screen
3. Compare the screenshots

What is the expected behavior?
The headless screenshots should not have rendering differences caused by changing the physical screen setup.

What went wrong?
The headless screenshots are rendered with different color calibration depending on the physical monitor that is configured as the primary display.

Did this work before? No 

Chrome version: 61.0.3163.39  Channel: beta
OS Version: OS X 10.12.6
Flash Version: 

Headless Chrome is excellent!  Thank you!

We are using headless chrome to track UI changes, and this issue makes it difficult to compare across developers and work stations.