Mojo: Implement support for |Foo&| mojom syntax

mojo/public/interfaces/bindings/tests/sample_factory.mojom

Index: mojo/public/interfaces/bindings/tests/sample_factory.mojom
diff --git a/mojo/public/interfaces/bindings/tests/sample_factory.mojom b/mojo/public/interfaces/bindings/tests/sample_factory.mojom
index 42408bdaa78ef4ed470cf11dff012a1dbf259672..daaed1e0a42767ae12d890a3c991b321b2f65130 100644
--- a/mojo/public/interfaces/bindings/tests/sample_factory.mojom
+++ b/mojo/public/interfaces/bindings/tests/sample_factory.mojom
@@ -19,10 +19,16 @@ struct Response {
   handle<message_pipe> pipe;
 };
 
+interface Object {
+  SetName(string name);
+  GetName() => (string name);
+};
+
 [Client=FactoryClient]
 interface Factory {
   DoStuff(Request request, handle<message_pipe> pipe);
   DoStuff2(handle<data_pipe_consumer> pipe);
+  CreateObject(Object& obj);
 };
 
 interface FactoryClient {