Dart: Adds a content handler and a test.

services/dart/lib/src/service_provider.dart

Index: services/dart/lib/src/service_provider.dart
diff --git a/services/dart/lib/src/service_provider.dart b/services/dart/lib/src/service_provider.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f3ac81cda2a842636515d0c77874dd656514721b
--- /dev/null
+++ b/services/dart/lib/src/service_provider.dart
@@ -0,0 +1,19 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+part of application;
+
+typedef bindings.Interface InterfaceFactory(
+    core.MojoMessagePipeEndpoint endpoint);
+
+class ServiceProvider implements service_provider.ServiceProviderInterface {
+  InterfaceFactory _interfaceFactory;
+
+  ServiceProvider(this._interfaceFactory);
+
+  connectToService(String interfaceName, core.MojoMessagePipeEndpoint pipe) {
+    var interfaceImpl = _interfaceFactory(pipe);
+    interfaceImpl.listen();
+  }
+}

[abarth-chromium, 2015/01/18 22:19:02]

I'm not sure why we need this code.  Why isn't this code just generated from the
mojom for ServiceProvider?

[zra, 2015/01/20 17:36:51]

The message pipe handle in the mojom doesn't (and can't, I think) have a more
specific type. Instead, the type the handle should have is taken from the
factory closure passed to the constructor. I'm not sure whether I should
generate code to do this for every message pipe handle in a mojom.