Update to latest WebXR spec, add tests
This pulls in a bunch of the newer stuff. I think with this PR we're spec-compatible for the things we support.
<s>For testing I'm likely going to write custom tests rather than adapting the existing ones, as a first pass, but when I start adapting the existing ones these changes will make it smoother.</s>
This PR also adds some pretty simple tests that deal with core functionality.
r? @jdm @asajeffrey
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Fix already borrowed error in webdriver
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Split getter for mutation_observers() into two methods.
Please let me know if these API changes look good:
registered_mutation_observers() returns immutable references and does
not init mutation observers.
registered_mutation_observers_mut() lazily initializes raredata if it
does not exist.
Updated code that uses this methods to call appropriate method when
mutation is not necessary.
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Implement WheelEvent interface
Created a new dom interface: "WheelEvent" and added WPT tests to confirm the interface works. To do this I had to do the following:
- Create a new `WheelEvent` dom interface. It can be found in `script/dom/wheelevent.rs` and `dom/webidls/WheelEvent.webidl`
- Add a new `WheelEvent` option to the compositor's `CompositorEvent` enum
- Add a new `Wheel` option to the compositor's `WindowEvent` enum
- Add a new `WheelDelta` type to the `script_traits` module
- Modify the `scroll_event` logic. Now we send a `WheelEvent` before scrolling. Repeat: we send the WheelEvent notification BEFORE we send the scroll delta.
- Add two manual wpt tests to the `uievents/order-of-events` test collection
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The wheelevent sends a signal when a supported device is rotated in the
x, y, or z rotational dimensions. These tests only check whether this
signal is received for any rotation at all.
Note: The WheelEvent interface supports rotation in all 3 spatial
dimensions. This implementation only supports two due to limitations
in the Glutin compositor.
The wheelevent interface is a dom interface that triggers for any
attached device that can rotate in one or more spatial dimensions.
Traditionally this is the mouse wheel though other devices could be
used as well. E.g. the trackball on a trackball mouse.
Use TypeError instead of InvalidState for exception.
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Use TypeError instead of InvalidState as per https://github.com/whatwg/html/pull/4525 for making CustomElementConstructor exceptions more consistent.
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Remove unused code (4/4)
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Fourth and final PR in a series of PRs to remove unused/dead code from servo, powered by an (upcoming) tool of mine. Please take a look and tell me if you want to keep something.
* First PR: #23477
* Second PR: #23498
* Third PR: #23499
Shortstat of the combined PR series:
```
47 files changed, 7 insertions(+), 805 deletions(-)
```
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Net: removed opts::get() usage
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Removed usage of opts::get() in components/net.
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Profile: removed opts::get()
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Removed opts::get() from `profile` component. **Note** that `profile_traits` component is the only component that uses single `opts::get().signpost` for IpcBytesReceiver and IpcReceiver structs, i.e. for recv() type method.
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Start enabling automated webdriver tests
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Implement browsing context group and set
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