Add NODE_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO to represent that an element's descendant has animation.

components/style/dom.rs

@@ -309,6 +309,24 @@ pub trait TElement : PartialEq + Debug + Sized + Copy + Clone + ElementExt + Pre
     /// Only safe to call with exclusive access to the element.
     unsafe fn unset_dirty_descendants(&self);
 
+    /// Similar to the dirty_descendants but for representing a descendant of
+    /// the element needs to be updated in animation-only traversal.
+    fn has_animation_only_dirty_descendants(&self) -> bool {
+        false
+    }
+
+    /// Flag that this element has a descendant for animation-only restyle processing.
+    ///
+    /// Only safe to call with exclusive access to the element.
+    unsafe fn set_animation_only_dirty_descendants(&self) {
+    }
+
+    /// Flag that this element has no descendant for animation-only restyle processing.
+    ///
+    /// Only safe to call with exclusive access to the element.
+    unsafe fn unset_animation_only_dirty_descendants(&self) {
+    }
+
     /// Atomically stores the number of children of this node that we will
     /// need to process during bottom-up traversal.
     fn store_children_to_process(&self, n: isize);

components/style/gecko/wrapper.rs

@@ -42,6 +42,7 @@ use gecko_bindings::structs;
 use gecko_bindings::structs::{RawGeckoElement, RawGeckoNode};
 use gecko_bindings::structs::{nsIAtom, nsIContent, nsStyleContext};
 use gecko_bindings::structs::EffectCompositor_CascadeLevel as CascadeLevel;
+use gecko_bindings::structs::NODE_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO;
 use gecko_bindings::structs::NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO;
 use gecko_bindings::structs::NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE;
 use gecko_bindings::sugar::ownership::HasArcFFI;
@@ -510,6 +511,18 @@ impl<'le> TElement for GeckoElement<'le> {
         self.unset_flags(NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO as u32)
     }
 
+    fn has_animation_only_dirty_descendants(&self) -> bool {
+        self.flags() & (NODE_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO as u32) != 0
+    }
+
+    unsafe fn set_animation_only_dirty_descendants(&self) {
+        self.set_flags(NODE_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO as u32)
+    }
+
+    unsafe fn unset_animation_only_dirty_descendants(&self) {
+        self.unset_flags(NODE_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO as u32)
+    }
+
     fn store_children_to_process(&self, _: isize) {
         // This is only used for bottom-up traversal, and is thus a no-op for Gecko.
     }

components/style/gecko_bindings/structs_debug.rs

@@ -15654,6 +15654,9 @@ pub mod root {
         _bindgen_ty_118::NODE_SHARED_RESTYLE_BIT_2;
     pub const NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO: root::_bindgen_ty_118 =
         _bindgen_ty_118::NODE_SHARED_RESTYLE_BIT_1;
+    pub const NODE_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO:
+              root::_bindgen_ty_118 =
+        _bindgen_ty_118::NODE_SHARED_RESTYLE_BIT_2;
     pub const NODE_TYPE_SPECIFIC_BITS_OFFSET: root::_bindgen_ty_118 =
         _bindgen_ty_118::NODE_TYPE_SPECIFIC_BITS_OFFSET;
     #[repr(u32)]

components/style/gecko_bindings/structs_release.rs

@@ -15102,6 +15102,9 @@ pub mod root {
         _bindgen_ty_105::NODE_SHARED_RESTYLE_BIT_2;
     pub const NODE_HAS_DIRTY_DESCENDANTS_FOR_SERVO: root::_bindgen_ty_105 =
         _bindgen_ty_105::NODE_SHARED_RESTYLE_BIT_1;
+    pub const NODE_HAS_ANIMATION_ONLY_DIRTY_DESCENDANTS_FOR_SERVO:
+              root::_bindgen_ty_105 =
+        _bindgen_ty_105::NODE_SHARED_RESTYLE_BIT_2;
     pub const NODE_TYPE_SPECIFIC_BITS_OFFSET: root::_bindgen_ty_105 =
         _bindgen_ty_105::NODE_TYPE_SPECIFIC_BITS_OFFSET;
     #[repr(u32)]