Add a basic Mojo SerialService that implements GetDevices().

device/test/run_all_unittests.cc

Index: device/test/run_all_unittests.cc
diff --git a/device/test/run_all_unittests.cc b/device/test/run_all_unittests.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cd3adb586f932eeb1a94d04a23647358e1811acd
--- /dev/null
+++ b/device/test/run_all_unittests.cc
@@ -0,0 +1,18 @@
+// 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.
+
+#include "base/bind.h"
+#include "base/test/launcher/unit_test_launcher.h"
+#include "base/test/test_suite.h"
+#include "mojo/embedder/embedder.h"
+
+int main(int argc, char** argv) {
+  base::TestSuite test_suite(argc, argv);
+
+  mojo::embedder::Init();
+  return base::LaunchUnitTests(
+      argc,
+      argv,
+      base::Bind(&base::TestSuite::Run, base::Unretained(&test_suite)));
+}