paper-input cursor doesn't seem to support themeing

I'm trying to test cursor themeing for paper-input using this CSS:

```
  html /deep/ paper-input::shadow .cursor {
    background-color: pink;
  }
```

... but getting no result.  Similar CSS is able to modify the .focused-underline element, but cursor doesn't have any visual difference.  This is on latest stable Chrome on OSX.
