skygear.authloginOAuthProviderWithPopup does not work in IE11

[iam7seven7]

• Skygear SDK Date/Version: 1.7.2
• JS runtime:
• Skygear Server Date/Version:
• Is this a regression?
• Attached logs, screenshots

Expected Results

Popup should close

Actual Results

Popup did not close

Steps to reproduce

1. Call skygear.authloginOAuthProviderWithPopup()
2. Do whatever you need to in SSO provider page in popup
3. Popup is blank and won't auto close after login success.

At first it give error

Unhandled promise rejection ReferenceError: 'Promise' is undefined

After adding to auth_handler.html:

<script type="text/javascript" src="https://code.skygear.io/js/polyfill/latest/polyfill.min.js"></script>

, the error message goes away but the popup still won't close.

I believe it is because the popup cannot postMessage to the opener window as IE10/11 doesn't support cross-origin postMessage.
Possible workaround: https://stackoverflow.com/a/36630058

[louischan-oursky]

Per discussion with Carmen, we should add polyfill directly to the bundle itself. Instead, we should ensure all html templates include the polyfill

<script type="text/javascript" src="https://code.skygear.io/js/polyfill/latest/polyfill.min.js"></script>

before

our bundle.