Re: [w3c/FileAPI] Proposal: Add a crossOrigin option to Blob (Issue #192)

Hi all! I work with @shhnjk at Google, and have been thinking about an alternate API shape that is more broadly applicable while still solving many of the same goals. At a high level, my proposal is to:

1. Support a new `allow-unique-origin` sandbox flag that can be used with both CSP sandbox and `iframe#sandbox`
2. Add support for attaching response headers to created Blobs 

You can see the full details in [Sandbox allow-unique-origin and customizing Blob response headers](https://gist.github.com/ddworken/309363b5d140bcc5ff6b39fa4a8d7a12). I'm curious to hear folks thoughts on this alternative shape which enables creation of unique origins for iframes and HTML responses. 

cc: @mikewest @arturjanc 

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