Re: [webcomponents] [Shadow]: Style element should specify when to create and add style sheet in shadow DOM (bugzilla: 26850) (#56)

`document.styleSheets` doesn't just reflect rendering. Try
```
<script>
 var d = new Document()
 w(d.styleSheets.length)
 d.appendChild(document.createElement("style"))
 w(d.styleSheets.length)
</script>
```
in the Live DOM Viewer. It'll log 0, 1.

Given that I think we should go with 1.

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