Missing Polymer.dom()._query

[nazar-pc]

After commit 306cc81 from #3112 Shadow DOM support is broken.
Calling Polymer.updateStyles() results in:

TypeError: Polymer.dom(...)._query is not a function at HTMLElement.Polymer.Base._addFeature._updateRootStyles (...) at Function.Polymer.updateStyles (...) at HTMLDocument.ready_callback (...) at ...

Namely, Shadow DOM version of Polymer.dom(...) does not have _query() method used here:

polymer/src/standard/x-styling.html

Line 262 in e3753db

var c$ = Polymer.dom(root)._query(function(e) {

This should be fixed before next release.
@sorvell @kevinpschaaf

[nazar-pc]

Fixed in #3215

[devinivy]

Is there a simple test to be written to catch future regressions?

Edit
Ah, presumably this addition does the trick? https://github.com/Polymer/polymer/pull/3215/files#diff-0e5ec35aef25e29aa04d1f3c8e1b428eR65

[nazar-pc]

Yes, you're pointing to right location. I decided to reuse existing tests.