Adding Angular's DI package & Dart unittests which test it.

third_party/pkg/di/benchmark/injector_benchmark_common.dart

Index: third_party/pkg/di/benchmark/injector_benchmark_common.dart
diff --git a/third_party/pkg/di/benchmark/injector_benchmark_common.dart b/third_party/pkg/di/benchmark/injector_benchmark_common.dart
new file mode 100644
index 0000000000000000000000000000000000000000..752833a705242aeb13d552ac68e2be63e9483b88
--- /dev/null
+++ b/third_party/pkg/di/benchmark/injector_benchmark_common.dart
@@ -0,0 +1,47 @@
+library di.injector_benchmark_common;
+
+import 'package:benchmark_harness/benchmark_harness.dart';
+import 'package:di/di.dart';
+
+class InjectorBenchmark extends BenchmarkBase {
+  var injectorFactory;
+  var module;
+
+  InjectorBenchmark(name, this.injectorFactory) : super(name);
+
+  void run() {
+    Injector injector = injectorFactory([module]);
+    injector.get(A);
+    injector.get(B);
+
+    var childInjector = injector.createChild([module]);
+    childInjector.get(A);
+    childInjector.get(B);
+  }
+
+  setup() {
+    module = new Module()
+      ..type(A)
+      ..type(B)
+      ..type(C)
+      ..type(D)
+      ..type(E);
+  }
+}
+
+class A {
+  A(B b, C c);
+}
+
+class B {
+  B(D b, E c);
+}
+
+class C {
+}
+
+class D {
+}
+
+class E {
+}