CSS parser incorrectly parses "1.em" as "1em"

```
We are rewriting:

padding-top: 1.em

to:

padding-top:1em

CSS spec says that the number token is:

num     [0-9]+|[0-9]*\.[0-9]+

Spec CSS parser suggests tokenizing this as:

IDENT(padding-top) : INT(1) DELIM(.) IDENT(em)

not as:

IDENT(padding-top) : DIM(1,em)
```

Original issue reported on code.google.com by `sligocki@google.com` on 27 Feb 2013 at 7:26
