TranscludingComponentFactory Passes a Wrong Element to onShadowRoot

[vsavkin]

TranscludingComponentFactory passes the component's element to onShadowRoot, whereas it should pass an instance of EmulatedShadowRoot.

This means the following will throw:

@Component(useShadowDom: false)
class MyComponent implements ShadowRootAware {
  void onShadowRoot(ShadowRoot shadowRoot) {}
}

Whereas the following will not:

@Component(useShadowDom: false)
class MyComponent implements ShadowRootAware {
  void onShadowRoot(shadowRoot) {} //here shadowRoot is not really a shadow root!!!
}