Steps to reproduce the problem:
1. Open Chrome on any Android or iOS devices
2. Open any web page like google.com
3. Open JS Console
4. Run JS: console.log(Intl.DateTimeFormat().resolvedOptions().timeZone);
5. It outputs the best-guess Timezone.
6. Change device timezone manually to Beijing/Shanghai GMT+08:00
7. Run JS: console.log(Intl.DateTimeFormat().resolvedOptions().timeZone);
8. It outputs "America/Chicago" 

What is the expected behavior?
When mobile device timezone is set to GMT+08:00, Intl.DateTimeFormat().resolvedOptions().timeZone should return "Asia/Shanghai" or similar GMT+08:00 timezone names.

What went wrong?
When system uses "Asia/Shanghai" (China Standard Time - CST), Chome returns "America/Chicago" (Central Standard Time - CST) instead.

Did this work before? N/A 

Chrome version: 57.0.2987.132  Channel: stable
OS Version: 6.0.1
Flash Version: 

Chrome returns wrong timezone name when the mobile device sets to the following Timezone (list may not be complete):
· Atlantic Time (Barbados) GMT-04:00
· Buenos Aires GMT-03:00
· Beijing China GMT+08:00
· Cairo GMT+02:00
· Taipei China GMT+08:00

Same problem not reproducible on Chrome on Desktop. Problem only observed on Android and iOS systems.