Preliminary WebXR support
This implements just enough WebXR to display to 3DOF devices in
immersive mode only.
Couple missing things:
- [ ] Handling reference spaces (even if just supporting eye-level spaces)
- [x] Spec links
- [ ] We enter immersive mode when baseLayer is set, but it seems like
we're supposed to do this when requestSession is called (https://github.com/immersive-web/webxr/issues/453)
- [ ] VR/XR should block less (https://github.com/servo/servo/issues/22505)
- [x] More pref-gating
- [x] `views` is a method instead of an attribute because we don't support FrozenArray
<s>Once I add spec links and pref gating</s> this can be landed as-is for further experimentation.
r? @jdm @MortimerGoro
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Construct URLSearchParams from array or object
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- [x] These changes fix#22554, fix#22556 and also fix#22557
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Remove sync constellation -> embedder communication
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Update ServiceWorker webidl
About the `void postMessage`, I found the spec doesn't have `[Throws]`; however, as the implementation for `postMessage` in spec, we should have `[Throws]` for it because it will throw errors. Then, I realized that `[Throws]` is not part of standard webidl. Btw, there's a issue discussing about if `[Throws]` should be standardized or not at heycam/webidl#603.
Also, per the spec, `ServiceWorker` will `includes` `AbstractWorker` instead of `implements` so I filed #22539 for it. We can update it after the issue is fixed.
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Update ServiceWorkerContainer Webidl
Looks like the spec has changed a lot. Maybe it's better to update the implementation for these methods in a separate PR.
Let's just update webidl in this PR?
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Instead of per-document. This also allows to reuse this thread-pool if needed
for other stuff, like parallel CSS parsing (#22478), and to share more code with
Gecko, which is always nice.
#22484 small cleanup
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Avoid sending idle message more than once after a reflow is complete
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A boolean variable is introduced to prevent sending SetDocumentState idle message multiple times after a reflow is complete.
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Fix DuckDuckGo HTML search
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