Re: [streams] Add IsReadableStreamDisturbed predicate (#385)

>  import WritableStream from './lib/writable-stream';
>  import ByteLengthQueuingStrategy from './lib/byte-length-queuing-strategy';
>  import CountQueuingStrategy from './lib/count-queuing-strategy';
>  import TransformStream from './lib/transform-stream';
>  
>  global.ReadableStream = ReadableStream;
> +global.IsReadableStreamDisturbed = IsReadableStreamDisturbed;

Yes, that sounds good. And maybe move them to a separate abstract-ops.js or from-other-specs.js test file.

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