Update mojo sdk to rev 9fbbc4f0fef1187312316c0ed992342474e139f1

mojo/public/dart/src/struct.dart

+// 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 bindings;
+
+class DataHeader {
+  static const int kHeaderSize = 8;
+  static const int kSizeOffset = 0;
+  static const int kNumFieldsOffset = 4;
+  final int size;
+  final int numFields;
+
+  const DataHeader(this.size, this.numFields);
+
+  String toString() => "DataHeader($size, $numFields)";
+}
+
+abstract class Struct {
+  final int encodedSize;
+
+  Struct(this.encodedSize);
+
+  void encode(Encoder encoder);
+
+  Message serialize() {
+    var encoder = new Encoder(encodedSize);
+    encode(encoder);
+    return encoder.message;
+  }
+
+  ServiceMessage serializeWithHeader(MessageHeader header) {
+    var encoder = new Encoder(encodedSize + header.size);
+    header.encode(encoder);
+    encode(encoder);
+    return new ServiceMessage(encoder.message, header);
+  }
+}