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

third_party/pkg/di/lib/static_injector.dart

Index: third_party/pkg/di/lib/static_injector.dart
diff --git a/third_party/pkg/di/lib/static_injector.dart b/third_party/pkg/di/lib/static_injector.dart
new file mode 100644
index 0000000000000000000000000000000000000000..71931005b8d318dacd74a3caf1deafcff7fa06cc
--- /dev/null
+++ b/third_party/pkg/di/lib/static_injector.dart
@@ -0,0 +1,33 @@
+library di.static_injector;
+
+import 'di.dart';
+
+typedef Object TypeFactory(factory(Type));
+
+/**
+ * Static implementation of [Injector] that uses type factories
+ */
+class StaticInjector extends Injector {
+  Map<Type, TypeFactory> typeFactories;
+
+  StaticInjector({List<Module> modules, String name,
+                 bool allowImplicitInjection: false, this.typeFactories})
+      : super(modules: modules, name: name,
+          allowImplicitInjection: allowImplicitInjection);
+
+  StaticInjector._fromParent(List<Module> modules, Injector parent, {name})
+      : super.fromParent(modules, parent, name: name);
+
+  newFromParent(List<Module> modules, String name) {
+    return new StaticInjector._fromParent(modules, this, name: name);
+  }
+
+  Object newInstanceOf(Type type, ObjectFactory getInstanceByType,
+                       Injector requestor, error) {
+    TypeFactory typeFactory = (root as StaticInjector).typeFactories[type];
+    if (typeFactory == null) {
+      throw new NoProviderError(error('No type factory provided for $type!'));
+    }
+    return typeFactory((type) => getInstanceByType(type, requestor));
+  }
+}