Animation: Aggregate Animated Image Info to Document (#36141)

Signed-off-by: rayguo17 <rayguo17@gmail.com>

components/script/image_animation.rs

@@ -0,0 +1,29 @@
+/* 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 fxhash::FxHashMap;
+use script_layout_interface::ImageAnimationState;
+use style::dom::OpaqueNode;
+
+#[derive(Clone, Debug, Default, JSTraceable, MallocSizeOf)]
+pub struct ImageAnimationManager {
+    #[no_trace]
+    pub node_to_image_map: FxHashMap<OpaqueNode, ImageAnimationState>,
+}
+
+impl ImageAnimationManager {
+    pub fn new() -> Self {
+        ImageAnimationManager {
+            node_to_image_map: Default::default(),
+        }
+    }
+
+    pub fn take_image_animate_set(&mut self) -> FxHashMap<OpaqueNode, ImageAnimationState> {
+        std::mem::take(&mut self.node_to_image_map)
+    }
+
+    pub fn restore_image_animate_set(&mut self, map: FxHashMap<OpaqueNode, ImageAnimationState>) {
+        let _ = std::mem::replace(&mut self.node_to_image_map, map);
+    }
+}