Adding Angular and dependent packages for testing

third_party/pkg/angular/perf/mirror_perf.dart

+library angular.perf.mirror;
+
+import '_perf.dart';
+import 'dart:mirrors';
+
+main() {
+  var c = new Obj(1);
+  InstanceMirror im = reflect(c);
+  Symbol symbol = new Symbol('a');
+  Watch head = new Watch();
+  Watch current = head;
+  for(var i=1; i < 10000; i++) {
+    Watch next = new Watch();
+    current = (current.next = new Watch());
+  }
+
+  var dirtyCheck = () {
+    Watch current = head;
+    while(current != null) {
+      if (!identical(current.lastValue, current.im.getField(current.symbol).reflectee)) {
+        throw "We should not get here";
+      }
+      current = current.next;
+    }
+  };
+
+  var dirtyCheckFn = () {
+    Watch current = head;
+    while(current != null) {
+      if (!identical(current.lastValue, current.getter(current.object))) {
+        throw "We should not get here";
+      }
+      current = current.next;
+    }
+  };
+
+  time('fieldRead', () => im.getField(symbol).reflectee );
+  time('Object.observe', dirtyCheck);
+  time('Object.observe fn()', dirtyCheckFn);
+}
+
+class Watch {
+  dynamic lastValue = 1;
+  Watch next;
+  String location;
+  dynamic object = new Obj(1);
+  InstanceMirror im;
+  Symbol symbol = new Symbol('a');
+  Function getter = (s) => s.a;
+
+  Watch() {
+    im = reflect(object);
+  }
+}
+
+class Obj {
+  var a;
+
+  Obj(this.a);
+}