Receive streams in WebRTC (and MediaStreamTrack support)
This adds the `ontrack` event handler to webrtc, and all the `MediaStreamTrack` stuff necessary to make it work.
WebRTC has the ability to group media tracks into streams using MSIDs, but I haven't yet figured out how to do this. For now, `ontrack` should work.
This _should_ be complete, but it hasn't yet been tested (hence the WIP)
r? @ferjm or @jdm
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Finish the implementation of the HTMLMediaElement canPlayType method
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Now servo/media player requires a new parameter for its creator, which
is a trait object that provides the GL parameters needed for setup the
generation of frames as GL textures.
This patch provides a dummy GL context trait object where the code
path will go to the default of raw frames.
Webaudio test expectation also were changed, adding two new failing
tests.
Refactor promise compartment
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This PR adds a mechanism to verify that certain code is executed inside a ```JSAutoCompartment```, and applies this to the ```Promise::new_in_current_compartment``` constructor.
r? @jdm
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Implement HTMLMediaElement.loop Attribute
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Work done for Implementing HTMLMediaElement.loop Attribute,
- Uncomment `loop` attribute from webidl
- Add make_bool macros for Loop and SetLoop functions
- Update the required tests
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- [x] These changes fix#22290
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Add referrer to navigation fetch request
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Implement step 13 of [following hyperlinks](https://html.spec.whatwg.org/#following-hyperlinks-2) and step 14.3 of [window open](https://html.spec.whatwg.org/#window-open-steps), as well as other referrer- and fetch-related updates.
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- this conforms to follow-hyperlinks spec step 13
- this conforms to window-open spec step 14.3
- replace uses of `referrer_url` with `referrer`
- in Request class, change "no-referrer" to ""
- set websocket fetch referrer to "no-referrer"
MediaStream playback through audio and video elements
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Implement HTMLMediaElement poster attribute
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- [x] These changes fix#22288
- [x] There are tests for these changes
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