Adam Barth 085b988e6a Make it possible for sky-element to register any tag name
... instead of hard-coding "example".

We do this by adding a custom constructor for Element that gets the |tagName|
property off the instance.

R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/943153002
2015-02-21 08:02:32 -08:00
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