script: Move CSS DOM interfaces to script/dom/css/ (#40241)

Moves interfaces defined by the CSS spec to the `script/dom/css/` module
from `script/dom/`.

Testing: Just a refactor shouldn't need any testing
Fixes: Partially #38901

Signed-off-by: WaterWhisperer <waterwhisperer24@qq.com>

components/script/dom/css/cssconditionrule.rs

@@ -0,0 +1,72 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+use std::cell::RefCell;
+
+use dom_struct::dom_struct;
+use servo_arc::Arc;
+use style::shared_lock::{Locked, SharedRwLock, SharedRwLockReadGuard};
+use style::stylesheets::CssRules as StyleCssRules;
+
+use super::cssgroupingrule::CSSGroupingRule;
+use super::cssmediarule::CSSMediaRule;
+use super::cssstylesheet::CSSStyleSheet;
+use super::csssupportsrule::CSSSupportsRule;
+use crate::dom::bindings::codegen::Bindings::CSSConditionRuleBinding::CSSConditionRuleMethods;
+use crate::dom::bindings::inheritance::Castable;
+use crate::dom::bindings::str::DOMString;
+
+#[dom_struct]
+pub(crate) struct CSSConditionRule {
+    cssgroupingrule: CSSGroupingRule,
+    #[ignore_malloc_size_of = "Stylo"]
+    #[no_trace]
+    rules: RefCell<Arc<Locked<StyleCssRules>>>,
+}
+
+impl CSSConditionRule {
+    pub(crate) fn new_inherited(
+        parent_stylesheet: &CSSStyleSheet,
+        rules: Arc<Locked<StyleCssRules>>,
+    ) -> CSSConditionRule {
+        CSSConditionRule {
+            cssgroupingrule: CSSGroupingRule::new_inherited(parent_stylesheet),
+            rules: RefCell::new(rules),
+        }
+    }
+
+    pub(crate) fn parent_stylesheet(&self) -> &CSSStyleSheet {
+        self.cssgroupingrule.parent_stylesheet()
+    }
+
+    pub(crate) fn shared_lock(&self) -> &SharedRwLock {
+        self.cssgroupingrule.shared_lock()
+    }
+
+    pub(crate) fn clone_rules(&self) -> Arc<Locked<StyleCssRules>> {
+        self.rules.borrow().clone()
+    }
+
+    pub(crate) fn update_rules(
+        &self,
+        rules: Arc<Locked<StyleCssRules>>,
+        guard: &SharedRwLockReadGuard,
+    ) {
+        self.cssgroupingrule.update_rules(&rules, guard);
+        *self.rules.borrow_mut() = rules;
+    }
+}
+
+impl CSSConditionRuleMethods<crate::DomTypeHolder> for CSSConditionRule {
+    /// <https://drafts.csswg.org/css-conditional-3/#dom-cssconditionrule-conditiontext>
+    fn ConditionText(&self) -> DOMString {
+        if let Some(rule) = self.downcast::<CSSMediaRule>() {
+            rule.get_condition_text()
+        } else if let Some(rule) = self.downcast::<CSSSupportsRule>() {
+            rule.get_condition_text()
+        } else {
+            unreachable!()
+        }
+    }
+}