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This would enable a bunch of interesting use-cases. The same rules that applies to media coming from an other origin would apply.
CreateObjectURL has been removed from the draft, however there is a proposal [1] to make MediaStreams work with postMessage - that could probably fulfill the use cases. [1] http://lists.w3.org/Archives/Public/public-media-capture/2013Oct/0120.html
createObjectURL is removed, so this bug is not relevant.