Set custom default timeouts for WebDriver classic session

[whimboo]

The default wdspec timeout for a complete file is set to 25s. Having a page_load timeout of 300s and a script timeout of 30s here doesn't make sense. As such I propose to use custom values for our wdspec tests which load pages from a local server anyway and that shouldn't take longer than around 3s.

To incorporate slow running builds we will also use the timeout multiplier to account for that.

[whimboo]

@gsnedders and @patrickangle could you please have a look at this proposed change? I would appreciate your review.

[gsnedders]

Somewhat to my surprise, the only regressions wpt.fyi shows for Safari are pre-existing flakiness. I'm amazed we don't have more things relying on longer timeouts!

I'd be happier with wpt.fyi reporting the results for the Chrome and Firefox runs—filed web-platform-tests/wpt.fyi#3210 for the fact it didn't do that.

[jgraham]

Seems fine to me; I agree with @gsnedders that it's a bit unfortunate to lose the test coverage for defaults, but I can't think of an easy way to work around that. Otherwise, as long as it doesn't show regressions in Gecko CI then I'm happy.

[whimboo]

Seems fine to me; I agree with @gsnedders that it's a bit unfortunate to lose the test coverage for defaults, but I can't think of an easy way to work around that. Otherwise, as long as it doesn't show regressions in Gecko CI then I'm happy.

As mentioned as part of the inline comment we do not loose coverage. The default values are checked in /new_session/timeouts.py.

Here the results from the Gecko CI which as well look all fine: https://treeherder.mozilla.org/jobs?repo=try&revision=2d00abc97d081486070bebf0c39b43efe96243ed