Native CSS variable support

[Michael Giuffrida]

Hey Polymer folks,

The latest desktop Chrome supports CSS custom variables natively, as has Firefox for a while now. This should increase performance compared with shimming variables.

Is the Polymer shim aware of native implementations, or does it still spend cycles shimming them? Does this behavior change depending on how styling is done (<custom-style>s, inside/outside dom-modules, etc.)?

[Eric Bidelman]

+Steve Orvell 

I believe the shimmer runs regardless of native implementation. That's b/c other features like mixins and @apply are not implemented in any browser.

We've talked about a tool to pre-him styles. Not sure where that is the priority pipeline....

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[Chris Joel]

I can only speculate, but it is likely that when we do enable use of native custom properties, it will be in the form of an on/off switch (similar to toggling between Shadow and Shady DOM).

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[Steve Orvell]

We plan to add support for native custom properties. Because of our use of `@apply`, it's not quite as simple as just not doing the shimming when the native feature is available.

[Steve Orvell]

https://github.com/Polymer/polymer/issues/3339