Dispose animation controller in platform view benchmarks (#110413)

Author: orestesgaolin

dev/benchmarks/platform_views_layout/lib/main.dart

@@ -116,6 +116,13 @@ class _RotationContainerState extends State<RotationContainer>
     );
     _rotationController.repeat();
   }
+
+  @override
+  void dispose() {
+    _rotationController.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return RotationTransition(

dev/benchmarks/platform_views_layout_hybrid_composition/lib/main.dart

@@ -121,6 +121,13 @@ class _RotationContainerState extends State<RotationContainer>
     );
     _rotationController.repeat();
   }
+
+  @override
+  void dispose() {
+    _rotationController.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     return RotationTransition(