Mojo C++ bindings: support sync methods - part 1.

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

Index: mojo/public/interfaces/bindings/tests/test_sync_methods.mojom
diff --git a/mojo/public/interfaces/bindings/tests/test_sync_methods.mojom b/mojo/public/interfaces/bindings/tests/test_sync_methods.mojom
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index 0000000000000000000000000000000000000000..2df8a1c93c378f355e09cd19a82c882db456ce8d
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+++ b/mojo/public/interfaces/bindings/tests/test_sync_methods.mojom
@@ -0,0 +1,19 @@
+// Copyright 2016 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.
+
+module mojo.test;
+
+interface TestSync {
+  [Sync]
+  Get() => (int32 result);
+
+  [Sync]
+  Set(int32 value) => ();
+
+  [Sync]
+  Ping() => ();
+
+  [Sync]
+  Echo(int32 value) => (int32 result);
+};