Support for CSSOM CSSNamespaceRule interface

LayoutTests/fast/css/css-namespace-rule-expected.txt

Index: LayoutTests/fast/css/css-namespace-rule-expected.txt
diff --git a/LayoutTests/fast/css/css-namespace-rule-expected.txt b/LayoutTests/fast/css/css-namespace-rule-expected.txt
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+Check the basic attribute support of CSSOM CSSNamespaceRule
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS CSSRule.NAMESPACE_RULE is 10
+PASS namespacerule.type is 10
+PASS namespacerule.namespaceURI is "http://www.w3.org/1999/xhtml"
+PASS namespacerule.prefix is "my-namespace"
+PASS namespacerule.cssText is "@namespace my-namespace url(\"http://www.w3.org/1999/xhtml\");"
+PASS getComputedStyle(document.body).color is "rgb(255, 0, 0)"
+Deleting namespace rule when other rules are present should throw InvalidStateException.
+WARN: shouldBe() expects string arguments
+PASS 11 is 11
+Inserting new namespace rule when other rules are present should throw InvalidStateException.
+WARN: shouldBe() expects string arguments
+PASS 11 is 11
+PASS successfullyParsed is true
+
+TEST COMPLETE
+Here is some text!