Dart: Adds optional named arguments for creating bindings.

mojo/dart/test/bindings_generation_test.dart

Index: mojo/dart/test/bindings_generation_test.dart
diff --git a/mojo/dart/test/bindings_generation_test.dart b/mojo/dart/test/bindings_generation_test.dart
index e1bddef2434b9bab8d4d8973ea0e96307de02441..c9ece84a59dbda161f49d348d5c437a1e3bc6fd7 100644
--- a/mojo/dart/test/bindings_generation_test.dart
+++ b/mojo/dart/test/bindings_generation_test.dart
@@ -14,12 +14,11 @@ import 'package:mojo/public/interfaces/bindings/tests/test_structs.mojom.dart' a
 import 'package:mojo/public/interfaces/bindings/tests/rect.mojom.dart' as rect;
 
 class ProviderImpl implements sample.Provider {
-  sample.ProviderStub _stub;
+  sample.ProviderBinding _binding;
 
   ProviderImpl(core.MojoMessagePipeEndpoint endpoint) {
-    _stub = new sample.ProviderStub.fromEndpoint(endpoint)
-            ..delegate = this
-            ..listen();
+    _binding = new sample.ProviderBinding.fromEndpoint(
+        endpoint, delegate: this);
   }
 
   echoString(String a, Function responseFactory) =>