[WIP] Add DCHECK for mojo::edk::Init().

chromecast/app/cast_test_launcher.h

Index: chromecast/app/cast_test_launcher.h
diff --git a/chromecast/app/cast_test_launcher.h b/chromecast/app/cast_test_launcher.h
new file mode 100644
index 0000000000000000000000000000000000000000..9c25662026814bab28d8aa2249f6c7eb64ffba94
--- /dev/null
+++ b/chromecast/app/cast_test_launcher.h
@@ -0,0 +1,12 @@
+// Copyright 2017 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.
+
+namespace chromecast {
+namespace shell {
+
+// Runs chromecast test.
+int LaunchTests(int argc, char* argv[]);
+
+}  // namespace shell
+}  // namespace chromecast