Integrate CSS rewriter tests with client side CSS rewriter

This fixes a number of bugs in the client side CSS rewriter and
wires up tests.

Following CLs will:
1. add another parameter to sanitizeStylesheet to take a URL policy
   and re-enable the background-image tests for the client side rewriter
2. remove trivial differences in the output between the two rewriters
   to deal with ordering of split rulesets, choice of quotes,
   whether font-names are case-preserved
3. implement case-sensitive rule bodies


Submitted @4809

[Jasvir, 2012-03-16 05:06:10]

LGTM

http://codereview.appspot.com/5836053/diff/5001/tests/com/google/caja/plugin/...
File tests/com/google/caja/plugin/css-stylesheet-tests.js (right):

http://codereview.appspot.com/5836053/diff/5001/tests/com/google/caja/plugin/...
tests/com/google/caja/plugin/css-stylesheet-tests.js:144: "altGolden":
'a{font:12pt "times new roman" , "times" ,'
Aren't font names case sensitive?

[MikeSamuel, 2012-03-16 05:32:09]

On 2012/03/16 05:06:10, Jasvir wrote:
> LGTM
> 
>
http://codereview.appspot.com/5836053/diff/5001/tests/com/google/caja/plugin/...
> File tests/com/google/caja/plugin/css-stylesheet-tests.js (right):
> 
>
http://codereview.appspot.com/5836053/diff/5001/tests/com/google/caja/plugin/...
> tests/com/google/caja/plugin/css-stylesheet-tests.js:144: "altGolden":
> 'a{font:12pt "times new roman" , "times" ,'
> Aren't font names case sensitive?

Hrmm.  http://www.w3.org/TR/css3-syntax/ says

> The following rules always hold:
All CSS style sheets are case-insensitive, except for parts that are not under
the control of CSS. For example, the case-sensitivity of values of the HTML
attributes "id" and "class", of font names, and of URIs lies outside the scope
of this specification. Note in particular that element names are
case-insensitive in HTML, but case-sensitive in XML.

http://www.w3.org/TR/css3-fonts/ contradicts that

> For other family names, the user agent attempts to find the family name among
fonts defined via @font-face rules and then among available system fonts,
matching names with a case-insensitive comparison.

and that is specifically for font-families which seems controlling.