style: Return an infinite perspective in TransformOperation::Perspective::to_animated_zero

Differential Revision: https://phabricator.services.mozilla.com/D122919

components/style/values/generics/transform.rs

@@ -583,10 +583,10 @@ impl<T: ToMatrix> Transform<T> {
 /// Return the transform matrix from a perspective length.
 #[inline]
 pub fn create_perspective_matrix(d: CSSFloat) -> Transform3D<CSSFloat> {
-    if d < 0.0 {
-        Transform3D::identity()
-    } else {
+    if d.is_finite() {
         Transform3D::perspective(d.max(1.))
+    } else {
+        Transform3D::identity()
     }
 }