UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

Steps to reproduce the problem:
Enter Web Inspector, toggle device toolbar and try to change zoom factor in responsive design mode.

https://youtu.be/GatNeH901jc

What is the expected behavior?
If you’re working with presets — everything works ok, you can correctly zoom in/zoom out to see rendered output in specific scale (if you need to develop for device with custom dpi for example). 

What went wrong?
If you enter responsive design mode — view is always set Fit in window and zoom changes layout but not zoom of rendered layout

Did this work before? N/A 

Chrome version: 56.0.2924.87  Channel: n/a
OS Version: OS X 10.12.4
Flash Version: 

For example. I have 27 inch QHD monitor and want to test how my webapp layout will work on 33 inch 5k monitor (it can be rotated, splitted natively, etc. hundreds of presets i do not want to keep) so i enter the responsive design mode and enter 5120 × 2880 resolution, or 2880 × 5120, or 2560 × 2880, etc. but if I want to check visually for issues and see if it okay in pixel-to-pixel, so I set 100% scale… but it changes the resolution to 1557 × 687 (size of my current real viewport) causing different layout!