Creates a Blob object representing a file containing the image in the canvas, and invokes a callback with a handle to that object.
Currently, the html5 canvas element has a toDataURL method, which outputs a DOM string representing the backing bitmap. With the File API now widely implemented, it is appropriate to add a similar getBlob method, one which would return a Blob object. Passing Blob pointers around is quite a bit more efficient than passing large base64 encoded strings.
Ongoing technical constraints
Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?
OWP launch tracking bug
Link to entry on the feature dashboard
Requesting approval to ship?
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