feat(transformer): Support @Injectable() on static functions

modules/angular2/test/transform/directive_processor/all_tests.dart

@@ -93,6 +93,9 @@ void allTests() {
     'ERROR: Could not read asset at uri bad_relative_url.css from angular2|'
         'test/transform/directive_processor/invalid_url_files/hello.dart'
   ]);
+
+  _testNgDeps('should find and register static functions.',
+      'static_function_files/hello.dart');
 }
 
 void _testNgDeps(String name, String inputPath,

modules/angular2/test/transform/directive_processor/static_function_files/expected/hello.ng_deps.dart

@@ -0,0 +1,20 @@
+library static_function_files.hello.ng_deps.dart;
+
+import 'hello.dart';
+import 'package:angular2/angular2.dart';
+
+var _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerFunction(getMessage, {
+      'parameters': const [const [const Inject(Message)]],
+      'annotations': const Injectable()
+    })
+    ..registerType(Message, {
+      'factory': () => new Message(),
+      'parameters': const [],
+      'annotations': const [const Injectable()]
+    });
+}

modules/angular2/test/transform/directive_processor/static_function_files/hello.dart

@@ -0,0 +1,11 @@
+library static_function_files.hello;
+
+import 'package:angular2/angular2.dart';
+
+@Injectable()
+String getMessage(@Inject(Message) message) => message.value;
+
+@Injectable()
+class Message {
+  String value = 'hello!';
+}