[heycam/webidl] Is DOMHighResTimeStamp a "JSON type"? (#504)

https://heycam.github.io/webidl/#dfn-json-types does not explicitly include typedefs of JSON types as JSON types. That seems kind of bad.

This has interop implications: `performance.toJSON()` includes `timeOrigin` in Firefox and Edge, but not in Chrome.

/cc @TimothyGu @Zirro

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