Update WebIDL parser
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This includes IDL mixin support.
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- [x] These changes does not fix but helps #22539 / fixes#16244
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Codegen: throw type error when encountering an unknown argument
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FIX#24130
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Support default toJSON in WebIDL
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Ported related lines from gecko.
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Support running WebGL in its own thread or on the main thread.
This is the final missing piece to support WebGL in ANGLE on Windows. ANGLE doesn't support multiple GL contexts on separate threads using the same underlying Direct3d device, so we need to process all GL operations for WebGL on the same thread as the compositor. These changes try to retain enough flexibility to support both approaches so we can get WebGL working on Windows ASAP.
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Implement GetElementProperty wd command
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There are a few canvas2d-related dependencies that haven't updated, but they
only use euclid internally so that's not blocking landing the rest of the
changes.
Given the size of this patch, I think it's useful to get this landed as-is.
Implement DOMPoint.fromPoint
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Implements DOMPoint.fromPoint and fixes codegen to use default value when an optional dictionary member got `undefined`.
PS: The codegen change is about:
```webidl
dictionary MyDictionary {
optional short myMember = 0;
short anotherMember;
}
[Exposed=Window, Constructor]
interface MyInterface {
void myMethod(optional MyDictionary myDict);
};
```
```js
// The following two must behave same
new MyInterface().myMethod({ myMember: undefined, anotherMember = 0 });
new MyInterface().myMethod({ anotherMember = 0 });
```
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