There are a few canvas2d-related dependencies that haven't updated, but they
only use euclid internally so that's not blocking landing the rest of the
changes.
Given the size of this patch, I think it's useful to get this landed as-is.
Enable XR WPT tests
This enables the tests. Most still fail, I plan to go through the
failures more soon.
xrFrame_getPose's failure seems to indicate we have broken matrix math.
I'm not sure what, the bug seems to not come from a simple matrix
inversion/ordering mishap.
This does add empty stubs for session ending since the test infra relies on these existing for almost every test (https://github.com/servo/servo/issues/23788). We will need to add support for this from the webxr repo side. We also need to add support for user activation (https://github.com/servo/servo/issues/23787).
r? @asajeffrey
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Promise constructor
In this PR, measures are taken that prevent the ```Promise::new``` constructor from being used outside a compartment.
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