pub serve protocol enhancements

[DartBot]

<img src="https://avatars.githubusercontent.com/u/1269969?v=3" align="left" width="96" height="96"hspace="10"> Issue by devoncarew
Originally opened as dart-lang/sdk#13935

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Here's a proposal here: https://gist.github.com/devoncarew/6897835

and a spec that uses a similar protocol:

https://developers.google.com/chrome-developer-tools/docs/protocol/tot/page

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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I'm going to work on moving pub build over to using barback first. Is this blocking you?

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Added Accepted label.

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<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Added this to the M8 milestone.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Marked this as being blocked by #657.

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<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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Removed this from the M8 milestone.
Added this to the Later milestone.

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<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Removed Type-Defect label.
Added Type-Enhancement label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Removed Priority-Unassigned label.
Added Priority-Medium label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Marked this as blocking dart-lang/sdk#15859.

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<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Unmarked this as blocking dart-lang/sdk#15859.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Marked this as blocking dart-lang/sdk#15830.

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<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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Added DevStory label.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/46275?v=3" align="left" width="48" height="48"hspace="10"> Comment by munificent

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I'll coordinate any API changes we want with Keerti. As far as I know, this specific change isn't needed.

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cc @keertip.
Added NotPlanned label.