Update selectors to 0.10, with ToCss serialization.

tests/unit/style/parsing/selectors.rs

@@ -0,0 +1,22 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use cssparser::Parser;
+use selectors::parser::{Selector, ParserContext, parse_selector_list};
+use style::selector_impl::TheSelectorImpl;
+
+fn parse(input: &mut Parser) -> Result<Selector<TheSelectorImpl>, ()> {
+    let mut context = ParserContext::new();
+    context.in_user_agent_stylesheet = true;
+    context.namespace_prefixes.insert("svg".into(), ns!(svg));
+    parse_selector_list(&context, input).map(|mut vec| vec.pop().unwrap())
+}
+
+#[test]
+fn test_selectors() {
+    assert_roundtrip!(parse, "div");
+    assert_roundtrip!(parse, "svg|circle");
+    assert_roundtrip!(parse, "p:before", "p::before");
+    assert_roundtrip!(parse, "[border = \"0\"]:-servo-nonzero-border ~ ::-servo-details-summary");
+}