Update mojo sdk to rev bdbb0c7e396fc4044a8b194058d7a7e529715286

third_party/mojo/src/mojo/public/dart/lib/src/union.dart

Index: third_party/mojo/src/mojo/public/dart/lib/src/union.dart
diff --git a/third_party/mojo/src/mojo/public/dart/lib/src/union.dart b/third_party/mojo/src/mojo/public/dart/lib/src/union.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ce5e4d763726a55a500b37079a9b006c47ca35fc
--- /dev/null
+++ b/third_party/mojo/src/mojo/public/dart/lib/src/union.dart
@@ -0,0 +1,24 @@
+// Copyright 2015 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;
+
+abstract class Union {
+  void encode(Encoder encoder, int offset);
+}
+
+class UnionError {
+}
+
+class UnsetUnionTagError extends UnionError {
+  final curTag;
+  final requestedTag;
+
+  UnsetUnionTagError(this.curTag, this.requestedTag);
+
+  String toString() {
+    return "Tried to read unset union member: {{requestedTag}} "
+      "current member: {{curTag}}.";
+  }
+}