Implement missing functionality of AudioBufferSourceNode
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This is a tiny PR to support [Media #293](https://github.com/servo/media/pull/293). Last time I ran WPT there was only one failing AudioBufferSourceNode test (which I will debug later this week). Once I rebased, however, I started getting unrelated servo-media build failures:
```
error[E0599]: no method named `shutdown_audio_context` found for type `std::sync::Arc<servo_media::ServoMedia>` in the current scope
--> components/script/dom/baseaudiocontext.rs:566:14
error[E0599]: no method named `shutdown_player` found for type `std::sync::Arc<servo_media::ServoMedia>` in the current scope
--> components/script/dom/htmlmediaelement.rs:1866:18
```
I wanted to get this PR up so https://github.com/servo/media/pull/293 can be tested. When the unrelated build failures are fixed, I will run `./mach update-wpt` and update this PR.
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Finish the JSON clone algorithm for WebDriver
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Support default toJSON in WebIDL
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Ported related lines from gecko.
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Return ErrorStatus from webdriver_handlers
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With `webdriver 0.40`, `ErrorStatus` implements `Deserialize`. Now we can accommodate for multiple errors occuring in `webdriver_handlers`.
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Initial Actions support in WebDriver
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ISSUE-21803: Implement ConstantSourceNode audionode
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More or less followed the steps outlined in `components/script/dom/mod.rs` (and also used the [previous PR](https://github.com/servo/servo/pull/23152) on this issue as reference). Updated `wpt` tests as well.
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Also removes an unused duplicate of that file.
All the references to that file are made through
`/images/clear-100x50.png`. Since it didn't exist until now, the tests
were showing an empty expected result which confused me a bit while
debugging canvas issues.
Stylo: replace product={gecko,servo} with engine={gecko,servo-2013,servo-2020}
Renaming the variable helped make sure I looked at every use.
Also auto-generate relevant parts of `CSSStyleDeclaration.webidl`, to make libscript compile accordingly.
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Use origin of final HTTP response as document origin
I discovered surprising problems when loading pages from http://joshmatthews.net that load same-origin images and try to use them as webgl textures. Since there's a redirect from joshmatthews.net to www.joshmatthews.net, the images are not considered same-origin in Servo because the document stores the origin for the original request's URL, rather than the origin of the response that is received after processing any redirections.
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