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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Update servo-media. Remove implicit shutdown requests. It all happens…
… automagicly now
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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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Fix build error when using the 'webgl_backtrace' feature
This patch fixes a build error that happens when building with `--features webgl_backtrace`.
However, while working on this I've noticed that calling `Backtrace::new()` instantly causes a segmentation fault. This didn't happen with the example code of [the package](https://crates.io/crates/backtrace) though, so I wasn't sure where to report this (maybe related: [backtrace-rs/#150](https://github.com/rust-lang/backtrace-rs/issues/150), [backtrace-rs/#189](https://github.com/rust-lang/backtrace-rs/issues/189)).
cc @alexcrichton @jdm
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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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Remove redundant windowproxy transplanting
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I changed the isaac random to always be the 32 bits one because the 64
bits version doesn't work with ReseedingRng as it requires the
generator's output to be u32 for some reasons.
The other main change is that the reseed method doesn't exist anymore
and now rand recreates a new generator when it needs to reseed so I had
to add a new method for when we don't want a generator to be reseeded.
Closes#23558
Assert incumbent global is always some in get_incumbent_global hook
While working on module script, I'd like to use Promise with a custom
callback with type `Box<dyn TaskBox>` which means we didn't use web API
callbacks as native handlers. However, we'll get a panic from
`enqueue_promise_job` and the panic says we have a `null` incumbent
global. The main problem here is, the Promise API is strongly tied to JS
engine and it always assumes there's a meaningful answer for "what
specific global is this promise associated with". So, when I don't use
the Promise for a specific web API, our engine cannot find a proper
incumbent global for us so that we get the `null` incumbent global
panic.
To make us catch this case easier in the future, we should add the
assertion inside `get_incumbent_global` hook so that we can know this
quickly next time.
Ref: https://mozilla.logbot.info/servo/20190807#c16525481
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