Hot Module Reload is broken with shadowMode

[alancnet]

Do you want to request a feature or report a bug?

What is the current behavior?
If you update a style in your code editor, hot module reload will not update the style.

If the current behavior is a bug, please provide the steps to reproduce.

1. Create a project targeted for web components using shadowMode.
2. Make sure hot module reload is enabled
3. View your component in a browser
4. Make an update to the style
5. Observe no style change in the browser

What is the expected behavior?
Style should be updated in real time with HMR enabled.

If this is a feature request, what is motivation or use case for changing the behavior?

Please mention other relevant information such as your webpack version, Node.js version and Operating System.