Dart: Encode/Decode handle and interface types.

mojo/dart/embedder/test/dart_to_cpp_tests.dart

Index: mojo/dart/embedder/test/dart_to_cpp_tests.dart
diff --git a/mojo/dart/embedder/test/dart_to_cpp_tests.dart b/mojo/dart/embedder/test/dart_to_cpp_tests.dart
index af3e07630e4b34e7876e456b91a289c152ca89b3..531666a541f37f6d3db0d4f0a43b5fb5eb6d53b9 100644
--- a/mojo/dart/embedder/test/dart_to_cpp_tests.dart
+++ b/mojo/dart/embedder/test/dart_to_cpp_tests.dart
@@ -64,8 +64,8 @@ class DartSide extends DartSideInterface {
       var messagePipe1 = new core.MojoMessagePipe();
       var messagePipe2 = new core.MojoMessagePipe();
 
-      arg.dataHandle = dataPipe1.consumer.handle;
-      arg.messageHandle = messagePipe1.endpoints[0].handle;
+      arg.dataHandle = dataPipe1.consumer;
+      arg.messageHandle = messagePipe1.endpoints[0];
 
       var specialArg = new EchoArgs();
       specialArg.si64 = -1;
@@ -73,8 +73,8 @@ class DartSide extends DartSideInterface {
       specialArg.si16 = -1;
       specialArg.si8 = -1;
       specialArg.name = 'going';
-      specialArg.dataHandle = dataPipe2.consumer.handle;
-      specialArg.messageHandle = messagePipe2.endpoints[0].handle;
+      specialArg.dataHandle = dataPipe2.consumer;
+      specialArg.messageHandle = messagePipe2.endpoints[0];
 
       dataPipe1.producer.write(_sampleData.buffer.asByteData());
       dataPipe2.producer.write(_sampleData.buffer.asByteData());