Add a Mojo example apptest that runs in mojo_shell.

mojo/examples/apptest/example_client_application.h

Index: mojo/examples/apptest/example_client_application.h
diff --git a/mojo/examples/apptest/example_client_application.h b/mojo/examples/apptest/example_client_application.h
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index 0000000000000000000000000000000000000000..01571c20a85199e2bd5ac41c888a07644af62f6a
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+++ b/mojo/examples/apptest/example_client_application.h
@@ -0,0 +1,28 @@
+// 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_EXAMPLES_TEST_EXAMPLE_CLIENT_APPLICATION_H_
+#define MOJO_EXAMPLES_TEST_EXAMPLE_CLIENT_APPLICATION_H_
+
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/interface_factory.h"
+#include "mojo/public/cpp/system/macros.h"
+
+namespace mojo {
+
+class ExampleClientApplication : public ApplicationDelegate {
+ public:
+  ExampleClientApplication();
+  virtual ~ExampleClientApplication();
+
+  // ApplicationDelegate implementation.
+  virtual void Initialize(ApplicationImpl* app) MOJO_OVERRIDE;
+
+ private:
+  MOJO_DISALLOW_COPY_AND_ASSIGN(ExampleClientApplication);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_EXAMPLES_TEST_EXAMPLE_CLIENT_APPLICATION_H_