Pass ID suffix to sanitizeCssProperty for use with <global-name>s.

This supercedes CL 11883043 and just adds an optional parameter to
sanitizeCssProperty so that we can use the proper ID suffix with
global names like "foo" in

   p { animation-name: foo; animation-... }
   @keyframes foo { ... }

----

Submitted @r5511

[felix8a, 2013-07-26 20:50:19]

lgtm, but doesn't this need a testcase change too?

[MikeSamuel, 2013-07-26 21:06:49]

On 2013/07/26 20:50:19, felix8a wrote:
> lgtm, but doesn't this need a testcase change too?

No.  The testcase from the prior CL already passes the ID suffix to
sanitizeStylesheet which faithfully forwards it.

[felix8a, 2013-07-26 21:20:31]

On 2013/07/26 21:06:49, MikeSamuel wrote:
> On 2013/07/26 20:50:19, felix8a wrote:
> > lgtm, but doesn't this need a testcase change too?
> 
> No.  The testcase from the prior CL already passes the ID suffix to
> sanitizeStylesheet which faithfully forwards it.

ah, right, ok.