Browser compat: TaskFactory type using not supported API

[buyaa-n]

Method FromAsyncImpl(IAsyncResult asyncResult, Func<IAsyncResult, TResult>? endFunction, Action<IAsyncResult>? endAction, TaskCreationOptions creationOptions, TaskScheduler scheduler) of TaskFactory type using unsupported ThreadPool.RegisterWaitForSingleObject(...)

FutureFactory.cs

This needs browser specific implementation, probably just call the callback synchronously

Originally posted by @marek-safar in #43363 (comment)

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Issue content:	Method `FromAsyncImpl(IAsyncResult asyncResult, Func? endFunction, Action? endAction, TaskCreationOptions creationOptions, TaskScheduler scheduler)` of `TaskFactory` type using unsupported `ThreadPool.RegisterWaitForSingleObject(...)` FutureFactory.cs This needs browser specific implementation, probably just call the callback synchronously Originally posted by @marek-safar in #43363 (comment)
Issue author:	buyaa-n
Assignees:	-
Milestone:	-