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
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#22843 (GitHub issue number if applicable)
<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because ___
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23154)
<!-- Reviewable:end -->
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.
Make serializeToString serialize document nodes correctly
<!-- Please describe your changes on the following line: -->
This is the fix for ScriptThread panic when `new XMLSerializer().serializeToString(document);` is called.
r?@jdm
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#23130
<!-- Either: -->
- [x] There are tests for these changes OR
- [ ] These changes do not require tests because ___
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23153)
<!-- Reviewable:end -->
Implement DocumentFragment XML serialization.
When serializing a DocumentFragment node, we should follow [this guy](https://w3c.github.io/DOM-Parsing/#dfn-xml-serializing-a-documentfragment-node) and serialize the node's immediate children. This commit makes that change.
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [X] These changes fix#23134 (GitHub issue number if applicable)
<!-- Either: -->
- [x] There are tests for these changes OR
- [ ] These changes do not require tests because ___ well, they probably do, but I don't know how to do that and could use some help.
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23192)
<!-- Reviewable:end -->
Implement srcObject logic for Blob media providers
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] There are tests for these changes
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/23103)
<!-- Reviewable:end -->
