Reland "Measure iOS CPU/GPU percentage (#41234)" (#41426)

This reverts commit f1e7fe8142.

This fix is in https://github.com/flutter/packages/pull/39

dev/benchmarks/macrobenchmarks/lib/common.dart

@@ -5,3 +5,4 @@
 const String kCullOpacityRouteName = '/cull_opacity';
 const String kCubicBezierRouteName = '/cubic_bezier';
 const String kBackdropFilterRouteName = '/backdrop_filter';
+const String kSimpleAnimationRouteName = '/simple_animation';