Fix webgl transform feedback
This allows https://www.joshmatthews.net/webxr-particles/ to run in Servo. This change corresponds with the following spec text:
```
GL_INVALID_OPERATION is generated by glBeginTransformFeedback if no binding points would be used, either because no program object is active of because the active program object has specified no varying variables to record.
```
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Dirty canvas when exiting immersive sessions
Fixes https://github.com/servo/servo/issues/26162, fixesservo/webxr#155
We basically end up in a situation where the main thread is asleep. It's unclear to me why it doesn't wake up after attempts to interact with the screen, but we stopped dirtying the canvas during the immersive session (https://github.com/servo/servo/pull/26077) so the main thread wasn't awake initially.
This is probably not the cleanest fix -- we really should not be ending up in situations where the main thread is perma-asleep -- however, we should be dirtying the canvas after exiting immersive mode _anyway_ since the contents need to be shown to the user, so this fix is still valid, even if it's not fixing the root cause.
Update checking origin trustworthy align to spec
While reading the [spec of ` Is origin potentially trustworthy? `](https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy), I found our second step is wrong; then, I found Josh said we didn't check it with `https` because we didn't support https in tests yet (https://github.com/servo/servo/pull/13574#discussion_r89346191).
IIRC, we've supported https wpt tests now so it might be fine to change it to align with spec.
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Add FromJSValConvertible for enums
Fixes https://github.com/servo/servo/issues/26169
This adds FromJSValConvertible implementations for webidl enums, which allows them to be used within `sequence<>`, etc.
This also uses these implementations when converting arguments.
https://heycam.github.io/webidl/#es-overloads
In step 12, the platform object check is for substep 4, but importantly it only matters if `V` implements the matching interface. If not, it should be able to fall back to substep 10 and attempt conversion to a dictionary.
Remove WebVR
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Removes support for WebVR. WebXR is our future!
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Fix ServiceWorker in multiprocess
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FIX#15217FIX#26100
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There is no need to set the dirty descendants flag unsafely from the layout side
for elements with pending restyles, we can do that on the DOM side when draining
the restyles from the Document.
More layout cleanups from the introduction of a lifetime in LayoutDom<T>
What can I say, the follow-up fixes just kept coming to my door one by one, I couldn't just tell them to go away.
For clarity, I introduce <LayoutDom<Element>>::parent_node_ref to contain
the remaining unsafety bits out of composed_parent_node_ref which is more
complex than just a field access.
