Move {lower,upper}-alpha to extra_servo_values
These two counter styles are supported via @counter-style rules in UA style sheet in Gecko.
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Make datetime just reflect
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This just uses `make_getter!` for `datetime` rather than checking if `datetime` has data and falling back to the child data if `datetime` has no data.
I reverted 2 of the test changes and added back an old test that makes sure that child content is not returned when `datetime` is empty.
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Implement CSSStyleRule.style
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Fix linear gradient's specified form #13892
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WIP for #13892
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Stylo: Basic support for grid-{row,column}-{start,end}
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Implement GetGATTChildren
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Implement the [GetGATTChildren](https://webbluetoothcg.github.io/web-bluetooth/#getgattchildren) function for webbluetooth.
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This allows us to get rid of a bunch of lifetimes and simplify a lot of code. It
also lets us get rid of that nasty lifetime transmute, which is awesome.
The situation with thread-local contexts is still suboptimal, but we fix that in
subsequent patches.
Update atoms when build geckolib with gecko
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This would automatically update the generated atom-related files in-tree before calling cargo to build geckolib. With this change, `./mach build-gecko --with-gecko` should be now the easiest way to update all in-tree bindings.
This isn't really a build-time generating, because it isn't invoked from the build script, but from mach. It isn't done the other way because
1. it doesn't seem to be a common practice for build script to write anything to the src directory
2. real build-time generated atom data wouldn't need to include atoms for multiple platforms, but we still want it so that we can build geckolib independently
cc @heycam
r? @emilio
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Rename ScriptChan in constellation to EventLoop
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We currently have a type `ScriptChan` in the constellation, which is named after its implementation rather than its semantics. In the spec, the nearest concept seems to be event loop https://html.spec.whatwg.org/multipage/#event-loop.
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