Elliott Sprehn 0ae7b5288f Improve SkyElement.
- Don't stamp the template repeatedly when attaching.
- Don't use __proto__
- Store the template in an external map instead of a property on the prototype.
- Add a created() callback.
- Allow creating a SkyElement with no associated <template> or ShadowRoot.

R=rafaelw@chromium.org

Review URL: https://codereview.chromium.org/715203002
2014-11-12 12:32:39 -08:00
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2014-11-12 12:32:39 -08:00
2014-11-04 15:21:57 -08:00