Mojo: Add the ability to hook up a channel to the embedder API.

mojo/system/test_embedder.h

Index: mojo/system/test_embedder.h
diff --git a/mojo/system/test_embedder.h b/mojo/system/test_embedder.h
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index 0000000000000000000000000000000000000000..457165fc8ac109126a5be33fd882fbad8cffbe75
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+++ b/mojo/system/test_embedder.h
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+// 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.
+
+#ifndef MOJO_SYSTEM_TEST_EMBEDDER_H_
+#define MOJO_SYSTEM_TEST_EMBEDDER_H_
+
+namespace mojo {
+namespace embedder {
+namespace test {
+
+// This shuts down the global, singleton instance. (Note: "Real" embedders are
+// not expected to ever shut down this instance. This |Shutdown()| function will
+// do more work to ensure that tests don't leak, etc.)
+// TODO(vtl): Figure out the library/component/DLL/export situation for test
+// embedder stuff. For now, it's linked directly into the unit test binary.
+void Shutdown();
+
+}  // namespace test
+}  // namespace embedder
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_EMBEDDER_H_