[mojo] Add typemap and variant support to generators

mojo/public/interfaces/bindings/tests/chromium_test.typemap

Index: mojo/public/interfaces/bindings/tests/chromium_test.typemap
diff --git a/mojo/public/interfaces/bindings/tests/chromium_test.typemap b/mojo/public/interfaces/bindings/tests/chromium_test.typemap
new file mode 100644
index 0000000000000000000000000000000000000000..102898295e369027d21c6daa926253d05b5d2a5f
--- /dev/null
+++ b/mojo/public/interfaces/bindings/tests/chromium_test.typemap
@@ -0,0 +1,14 @@
+// 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.
+
+{
+  "c++": {
+    "mojo.test.PickledStruct": {
+      "typename": "mojo::test::PickledStructChromium",
+      "headers": [
+        "mojo/public/cpp/bindings/tests/pickled_struct_chromium.h"
+      ]
+    }
+  }
+}