NSFileProviderExtension need a download progress callback handler

Originator:baozhifei
Number:rdar://6468254629 Date Originated:01/10/2018
Status:Open Resolved:NO
Product:NSFileProviderExtension Product Version:11.0
Classification: Reproducible:YES
 
Hi,

   In a file provider extension, I start to  download a item with [NSFileProviderExtension startProvidingItemAtURL:completionHandler], it only has  a complete handler, we need a download progress handler.

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