Rewrite accessibility/crashtests/svg-mouse-listener.html to avoid timeout

[cookiecrook]

@boazsender wrote

The test [@cookiecrook] linked with the timeouts doesn't seem to be one of the B accessibility crash tests (although it's pretty weird that it's timing out across all browsers).

It's timing out because currently crashtests don't support testdriver (see web-platform-tests/wpt#13183 which is mostly about reftests; crashtests are probably slightly easier, but the story is similar).

For now you'd need to rewrite that as a testharness test.

Originally posted by @jgraham in #100 (comment)

[cookiecrook]

@kevers-google @aleventhal FYI your WPT patch via Chromium seems to have broken the WPT results. Do you want to fix it or should we roll out the change?

[kevers-google]

Sorry for the delayed response. I'll fix the test.

[kevers-google]

https://chromium-review.googlesource.com/c/chromium/src/+/5348198

This test was the only one in accessibility/crashtests using test-driver. We need async behavior here in order to actually process the click event. Otherwise, we have a memory leak (at least in Blink) due to the unhandled event. In fact, the test as originally authored could end before the synthetic event is even triggered. The solution in review moves the test out of crashtests and converts it to a promise_test.

[kevers-google]

Believe this issue can now be closed as the relevant test is no longer a crashtest.