Thanks to info from below link, I'm able to troubleshoot my proxy problem with Chrome.
https://www.chromium.org/developers/design-documents/network-stack/debugging-net-proxy

To troubleshoot, in chrome, chrome://net-internals/#events
It gives you all sorts of information.

The pac file works in IE and Firefox but not in chrome after I upgraded to 1703.
The fix for now is start Chrome with command-line flag:
--winhttp-proxy-resolver