Port our microbenchmarks to the new world (#4121)
Our microbenchmarks now run on real devices.
diff --git a/dev/benchmarks/microbenchmarks/README.md b/dev/benchmarks/microbenchmarks/README.md
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+++ b/dev/benchmarks/microbenchmarks/README.md
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+# microbenchmarks
+
+To run these benchmarks on a device:
+
+```
+flutter run --release -t lib/gestures/velocity_tracker_data.dart
+flutter run --release -t lib/stocks/animation_bench.dart
+flutter run --release -t lib/stocks/build_bench.dart
+flutter run --release -t lib/stocks/layout_bench.dart
+```
+
+The results should be in the device logs.
