Add stylo FFI for cssText getters of CSSStyleRule

components/style/gecko_bindings/bindings.rs

@@ -1010,6 +1010,14 @@ extern "C" {
                                          index: u32)
      -> RawServoStyleRuleStrong;
 }
+extern "C" {
+    pub fn Servo_StyleRule_GetCssText(rule: RawServoStyleRuleBorrowed,
+                                      result: *mut nsAString_internal);
+}
+extern "C" {
+    pub fn Servo_StyleRule_GetSelectorText(rule: RawServoStyleRuleBorrowed,
+                                           result: *mut nsAString_internal);
+}
 extern "C" {
     pub fn Servo_ParseProperty(property: *const nsACString_internal,
                                value: *const nsACString_internal,

ports/geckolib/glue.rs

@@ -4,6 +4,7 @@
 
 use app_units::Au;
 use cssparser::Parser;
+use cssparser::ToCss as ParserToCss;
 use env_logger;
 use euclid::Size2D;
 use parking_lot::RwLock;
@@ -323,6 +324,18 @@ pub extern "C" fn Servo_StyleRule_Release(rule: RawServoStyleRuleBorrowed) -> ()
     unsafe { RwLock::<StyleRule>::release(rule) };
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_StyleRule_GetCssText(rule: RawServoStyleRuleBorrowed, result: *mut nsAString) -> () {
+    let rule = RwLock::<StyleRule>::as_arc(&rule);
+    rule.read().to_css(unsafe { result.as_mut().unwrap() }).unwrap();
+}
+
+#[no_mangle]
+pub extern "C" fn Servo_StyleRule_GetSelectorText(rule: RawServoStyleRuleBorrowed, result: *mut nsAString) -> () {
+    let rule = RwLock::<StyleRule>::as_arc(&rule);
+    rule.read().selectors.to_css(unsafe { result.as_mut().unwrap() }).unwrap();
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_ComputedValues_Get(node: RawGeckoNodeBorrowed)
      -> ServoComputedValuesStrong {