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/csslayerblockrule.rs

@@ -0,0 +1,94 @@
+/* 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, SharedRwLockReadGuard, ToCssWithGuard};
+use style::stylesheets::{CssRuleType, CssRules, LayerBlockRule};
+use style_traits::ToCss;
+
+use super::cssgroupingrule::CSSGroupingRule;
+use super::cssrule::SpecificCSSRule;
+use super::cssstylesheet::CSSStyleSheet;
+use crate::dom::bindings::codegen::Bindings::CSSLayerBlockRuleBinding::CSSLayerBlockRuleMethods;
+use crate::dom::bindings::reflector::reflect_dom_object;
+use crate::dom::bindings::root::DomRoot;
+use crate::dom::bindings::str::DOMString;
+use crate::dom::window::Window;
+use crate::script_runtime::CanGc;
+
+#[dom_struct]
+pub(crate) struct CSSLayerBlockRule {
+    cssgroupingrule: CSSGroupingRule,
+    #[ignore_malloc_size_of = "Stylo"]
+    #[no_trace]
+    layerblockrule: RefCell<Arc<LayerBlockRule>>,
+}
+
+impl CSSLayerBlockRule {
+    pub(crate) fn new_inherited(
+        parent_stylesheet: &CSSStyleSheet,
+        layerblockrule: Arc<LayerBlockRule>,
+    ) -> CSSLayerBlockRule {
+        CSSLayerBlockRule {
+            cssgroupingrule: CSSGroupingRule::new_inherited(parent_stylesheet),
+            layerblockrule: RefCell::new(layerblockrule),
+        }
+    }
+
+    #[cfg_attr(crown, allow(crown::unrooted_must_root))]
+    pub(crate) fn new(
+        window: &Window,
+        parent_stylesheet: &CSSStyleSheet,
+        layerblockrule: Arc<LayerBlockRule>,
+        can_gc: CanGc,
+    ) -> DomRoot<CSSLayerBlockRule> {
+        reflect_dom_object(
+            Box::new(CSSLayerBlockRule::new_inherited(
+                parent_stylesheet,
+                layerblockrule,
+            )),
+            window,
+            can_gc,
+        )
+    }
+
+    pub(crate) fn clone_rules(&self) -> Arc<Locked<CssRules>> {
+        self.layerblockrule.borrow().rules.clone()
+    }
+
+    pub(crate) fn update_rule(
+        &self,
+        layerblockrule: Arc<LayerBlockRule>,
+        guard: &SharedRwLockReadGuard,
+    ) {
+        self.cssgroupingrule
+            .update_rules(&layerblockrule.rules, guard);
+        *self.layerblockrule.borrow_mut() = layerblockrule;
+    }
+}
+
+impl SpecificCSSRule for CSSLayerBlockRule {
+    fn ty(&self) -> CssRuleType {
+        CssRuleType::LayerBlock
+    }
+
+    fn get_css(&self) -> DOMString {
+        let guard = self.cssgroupingrule.shared_lock().read();
+        self.layerblockrule.borrow().to_css_string(&guard).into()
+    }
+}
+
+impl CSSLayerBlockRuleMethods<crate::DomTypeHolder> for CSSLayerBlockRule {
+    /// <https://drafts.csswg.org/css-cascade-5/#dom-csslayerblockrule-name>
+    fn Name(&self) -> DOMString {
+        if let Some(name) = &self.layerblockrule.borrow().name {
+            DOMString::from_string(name.to_css_string())
+        } else {
+            DOMString::new()
+        }
+    }
+}