Re: [fetch] Feed a Response to existing APIs (#49)

Re-discussed at F2F 2015-07-22:

- Adapting srcObject to allow Response or ReadableStream (or ReadableByteStream??) is a good path forward.
- Cannot allow e.g. `Promise<Response>` since promises are not distinguishable from other types
- Can do HTMLImageElement, HTMLMediaElement, maybe HTMLScriptElement and HTMLStyleElement.


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