Revisit how the Android port works.
Fix#20855Fix#18625Fix#21147
Before polishing and making sure everything works fine (like the VR code, the android-x86 version, the non-android version of the lib, …), I'd like to get some early feedback on the approach.
I recommend reviewing commit by commit.
To test, just follow the regular steps:
```
./mach build -d --android
./mach package --dev --android builds servo.apk
./mach install --dev --android && ./mach run --android
```
---
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Introduce "per task source" cancellation
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- [ ] These changes fix#21119 (github issue number if applicable).
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Add window icon on X11 and Windows
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- [x] These changes fix#20761
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DOM structs embed their parent type as their first field. This
introduces a `.parent()` method to the DOM struct that returns its first
field, and codegens a type assert that ensures that `.parent()` returns
the parent struct.
This generates:
On `#[dom_struct]`:
```rust
impl HasParent for Type {
type Parent = ParentType;
fn as_parent(&self) -> ParentType {
&self.first_field
}
}
```
In the codegen files:
```rust
impl Type {
fn __assert_parent_type(&self) {
let _: &ParentType = self.as_parent();
}
}
````
Update mozjs_sys to include cross-compilation fixes.
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#20958
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