UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36

Steps to reproduce the problem:
1. Go http://mathieuancelin.github.io/js-repaint-perfs/frzr/index.html (private mode preffered, because no plugins with cause some interaction)
2. Open dev tools
3. Open timeline
4. Start for ~5 seconds
5. Stop
6. Zoom in
7. Pan left/right until summary scripting would be negative

What is the expected behavior?
Scripting time is sum of all scripting times in viewport.

What went wrong?
Scripting isn't sum of all scripting times, but calculates on difference between different pan/zoom positions, so it suddenly becomes invalid.

Did this work before? N/A 

Chrome version: 52.0.2743.116  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 22.0 r0

May be my screen resolution is an issue (4k).
May be my two displays are an issue.
Seems it's regression, in ~40.x versions all was ok. But I can't check.

NOTE: This is my very first report here, any suggestions are welcome.
 

Deleted: chrome_dev_tools_screenshot.png 323 KB

	chrome_dev_tools_screenshot.png 323 KB View Download