Add some Dart benchmarks running on fletch.

test/benchmark/method_call.dart

@@ -0,0 +1,78 @@
+class Toggle {
+  var _state;
+
+  Toggle(startState) {
+    _state = startState;
+  }
+
+  get value => _state;
+
+  activate() {
+    _state = !_state;
+    return this;
+  }
+}
+
+class NthToggle extends Toggle {
+  var _count;
+  var _countMax;
+
+  NthToggle(startState, maxCounter)
+      : super(startState) {
+    _countMax = maxCounter;
+    _count = 0;
+  }
+
+  activate() {
+    _count = _count + 1;
+    if (_count >= _countMax) {
+      super.activate();
+      _count = 0;
+    }
+
+    return this;
+  }
+}
+
+main() {
+  Stopwatch watch = new Stopwatch();
+  watch.start();
+
+  var n = 100000;
+  var val = true;
+  var toggle = new Toggle(val);
+
+  for (var i = 0; i < n; i++) {
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+    val = toggle.activate().value;
+  }
+
+  print(toggle.value);
+
+  val = true;
+  var ntoggle = new NthToggle(val, 3);
+
+  for (var i = 0; i < n; i++) {
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+    val = ntoggle.activate().value;
+  }
+
+  print(ntoggle.value);
+  print("elapsed: ${watch.elapsedMilliseconds / 1000}");
+}