Re: [webmessaging-tests] Fix test flakiness caused by not waiting for an iframe to load. (#4301)

Notifying @Ms2ger, @aogilvie, @jdm, @mkruisselbrink, and @zqzhang. *([Learn how reviewing works](https://github.com/w3c/web-platform-tests/blob/master/README.md#test-review).)*

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4301#issuecomment-265875271

Received on Thursday, 8 December 2016 22:29:53 UTC