UserAgent: Mozilla/5.0 (X11; CrOS x86_64 10323.58.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.167 Safari/537.36
Platform: 10323.58.0 (Official Build) beta-channel link

Example URL:
https://scheib.github.io/HTMLMisc/PointerLockLog.html

Steps to reproduce the problem:
1. Use Chrome on Chrome OS
2. Open https://scheib.github.io/HTMLMisc/PointerLockLog.html and lock cursor
3. Move mouse slowly and you will see movement jump to +-400 or more. (sometimes 600)
4. Will not happen if cursor is unlocked
5. Will not happen when using Chrome on Windows (this was an issue on Windows but was fixed via https://bugs.chromium.org/p/chromium/issues/detail?id=781182. Clearly it was a result of something else on Windows cause the update did not resolve the problem on Chrome OS.)
6. Will not happen when using Chrome on Ubuntu (using same Chrome OS device via Crouton). Ubuntu 16.04.3 LTS (Xenial Xerus) and 65.0.3325.181 (Official Build) (64-bit) works.

What is the expected behavior?
If cursor is locked, movement should be stabled in one direction and not jump.

What went wrong?
Mouse movement is not stable, sometimes jumps to +-400
even if you move mouse very slowly.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes

Chrome version: 65.0.3325.167  Channel: beta
OS Version: 10323.58.0
Flash Version: 29.0.0.113

This has been like this for over a year on various stable and beta releases. I figured it would get addressed as part of https://bugs.chromium.org/p/chromium/issues/detail?id=781182 but it didn't so I decided to finally create an issue against it.