Use ChartWrapper to load/render charts.

[wesalvaro]

This dumps a lot of code with no trade-off (hopefully).

It also loads the material chart libraries! yay

The only issue right now is that imageURIs are currently broken.

[wesalvaro]

R: @ebidel
This PR is currently just a preview. It's not ready for a proper review.

[joekarasek]

I had issues getting google charts to load/render correctly on Safari and Firefox when the bower dependency was passed through gulp-vulcanize (I'm building a polymer app). My understanding (and I'm a junior developer) is that the polyfill for web components caused a race situation: google was 'undefined'. I patched the problem by adding an additional CDN call for google charts loader to the head of the page, but am now getting a warning about multiple calls for google loader.

It would be great if your wrapper took care of this problem. I have not had the same issue with other google web components.

[wesalvaro]

Yes, this is an issue specific to the visualization libraries. It's being worked on, but is not ready yet.

Sorry for the inconvenience, I'd love to see it fixed, too.

[wesalvaro]

@joekarasek Do you still have the same issue with the latest version (1.1.0) of the element?

[rslawik]

Migrated to ChartWrapper in #250.