Add stylo FFI for CSSStyleRule.style

components/style/gecko_bindings/bindings.rs

@@ -1010,6 +1010,15 @@ extern "C" {
                                          index: u32)
      -> RawServoStyleRuleStrong;
 }
+extern "C" {
+    pub fn Servo_StyleRule_GetStyle(rule: RawServoStyleRuleBorrowed)
+     -> RawServoDeclarationBlockStrong;
+}
+extern "C" {
+    pub fn Servo_StyleRule_SetStyle(rule: RawServoStyleRuleBorrowed,
+                                    declarations:
+                                        RawServoDeclarationBlockBorrowed);
+}
 extern "C" {
     pub fn Servo_StyleRule_GetCssText(rule: RawServoStyleRuleBorrowed,
                                       result: *mut nsAString_internal);

ports/geckolib/glue.rs

@@ -324,6 +324,20 @@ pub extern "C" fn Servo_StyleRule_Release(rule: RawServoStyleRuleBorrowed) -> ()
     unsafe { RwLock::<StyleRule>::release(rule) };
 }
 
+#[no_mangle]
+pub extern "C" fn Servo_StyleRule_GetStyle(rule: RawServoStyleRuleBorrowed) -> RawServoDeclarationBlockStrong {
+    let rule = RwLock::<StyleRule>::as_arc(&rule);
+    rule.read().block.clone().into_strong()
+}
+
+#[no_mangle]
+pub extern "C" fn Servo_StyleRule_SetStyle(rule: RawServoStyleRuleBorrowed,
+                                           declarations: RawServoDeclarationBlockBorrowed) -> () {
+    let rule = RwLock::<StyleRule>::as_arc(&rule);
+    let declarations = RwLock::<PropertyDeclarationBlock>::as_arc(&declarations);
+    rule.write().block = declarations.clone();
+}
+
 #[no_mangle]
 pub extern "C" fn Servo_StyleRule_GetCssText(rule: RawServoStyleRuleBorrowed, result: *mut nsAString) -> () {
     let rule = RwLock::<StyleRule>::as_arc(&rule);