Creating a pexe content handler to translate and run pexes.

services/nacl/pexe_linker.mojom

Index: services/nacl/pexe_linker.mojom
diff --git a/mojo/public/interfaces/bindings/tests/test_included_unions.mojom b/services/nacl/pexe_linker.mojom
similarity index 65%
copy from mojo/public/interfaces/bindings/tests/test_included_unions.mojom
copy to services/nacl/pexe_linker.mojom
index 5c08681eda089a440f67369fadd07b6a4a0bd00f..4ebe64f67f2fb8c02fdc9730794bc78a7fe75a35 100644
--- a/mojo/public/interfaces/bindings/tests/test_included_unions.mojom
+++ b/services/nacl/pexe_linker.mojom
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module mojo.test;
+module mojo.nacl;
 
-union IncludedUnion {
-  int8 a;
+interface PexeLinker {
+  PexeLink(handle<message_pipe> message_handle);
 };