Re: [w3c/manifest] Add installation prompt control flow (#417)

I'm not sure we need a state machine: the "prompting" and "done" states aren't both needed... they are indistinguishable except for the error message so we can merge them into one and are back with a Boolean again.

(Actually, it'd be nice to work defaultPrevented into a multi-state machine, but since it's a Boolean in the underlying platform, let's not.)

So prompt becomes:
```
if (didPrompt) {
  error "prompt has already been shown"
  return;
}

if (defaultPrevented) {
  error "must call preventDefault first"
  return;
}

show prompt
didPrompt = true;
```

And if the prompt is automatically shown, it also sets didPrompt to true.

Does it need to be more complicated than that?

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