Process normal traversal for throttled animation flush as well.

MozReview-Commit-ID: BirD8BDMifp

components/style/traversal_flags.rs

@@ -34,6 +34,10 @@ bitflags! {
         /// Allows the traversal to run in parallel if there are sufficient cores on
         /// the machine.
         const ParallelTraversal = 1 << 7,
+        /// Flush throttled animations. By default, we only update throttled animations
+        /// when we have other non-throttled work to do. With this flag, we
+        /// unconditionally tick and process them.
+        const FlushThrottledAnimations = 1 << 8,
 
     }
 }
@@ -67,6 +71,7 @@ pub fn assert_traversal_flags_match() {
         ServoTraversalFlags_ClearAnimationOnlyDirtyDescendants =>
             ClearAnimationOnlyDirtyDescendants,
         ServoTraversalFlags_ParallelTraversal => ParallelTraversal,
+        ServoTraversalFlags_FlushThrottledAnimations => FlushThrottledAnimations,
     }
 }
 

ports/geckolib/glue.rs

@@ -278,13 +278,6 @@ pub extern "C" fn Servo_TraverseSubtree(root: RawGeckoElementBorrowed,
         }
     }
 
-    if traversal_flags.for_animation_only() {
-        debug!("Servo_TraverseSubtree complete (animation-only, aodd={})",
-               element.has_animation_only_dirty_descendants());
-        return element.has_animation_only_dirty_descendants() ||
-               element.borrow_data().unwrap().restyle.is_restyle();
-    }
-
     traverse_subtree(element,
                      raw_data,
                      traversal_flags,