Issue #10820 has been merged into this issue.

Issue #20901 has been merged into this issue.

This seems likely to be a problem. For example, the Intl library now uses deferred loading for message catalogs. I stumbled across this in updating a sample, but it seems likely to come up in a customer context before too long.

Do we have plans to address this?

I looked into it, and it seemed easier than expected:
https://codereview.chromium.org/569583002

The testcase from dartbug/20901 still has that CONSOLE ERROR: Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self'".
But it now passes, that might require more investegation.

Added Started label.

Fixed in r44162 https://codereview.chromium.org//968163002 .

Added Fixed label.