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FileList, Blob, File and FileReader should have [Exposed=Window,Worker] webidl annotations so that they're usable in workers. (FileList and Blob/File already survive structured clone.)
Fixed. The only interface which isn't annotated is the partial URL interface, but I think appropriate annotations (and decisions on whether it should be exposed on Workers) should happen as part of the URL spec. Relevant changes are: 1. http://dev.w3.org/2006/webapi/FileAPI/#blob 2. http://dev.w3.org/2006/webapi/FileAPI/#file 3. http://dev.w3.org/2006/webapi/FileAPI/#filelist-section (which isn't long for this world, and is likely to get replaced by an Array soon). 4. http://dev.w3.org/2006/webapi/FileAPI/#APIASynch 5. http://dev.w3.org/2006/webapi/FileAPI/#readingOnThreads