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diff --git a/mojo/shell/public/cpp/application_runner.h b/mojo/shell/public/cpp/application_runner.h
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+++ b/mojo/shell/public/cpp/application_runner.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_SHELL_PUBLIC_CPP_APPLICATION_RUNNER_H_
+#define MOJO_SHELL_PUBLIC_CPP_APPLICATION_RUNNER_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "mojo/public/cpp/system/core.h"
+
+namespace mojo {
+
+class ApplicationDelegate;
+
+// A utility for running a chromium based mojo Application. The typical use
+// case is to use when writing your MojoMain:
+//
+//  MojoResult MojoMain(MojoHandle shell_handle) {
+//    mojo::ApplicationRunner runner(new MyDelegate());
+//    return runner.Run(shell_handle);
+//  }
+//
+// ApplicationRunner takes care of chromium environment initialization and
+// shutdown, and starting a MessageLoop from which your application can run and
+// ultimately Quit().
+class ApplicationRunner {
+ public:
+  // Takes ownership of |delegate|.
+  explicit ApplicationRunner(ApplicationDelegate* delegate);
+  ~ApplicationRunner();
+
+  static void InitBaseCommandLine();
+
+  void set_message_loop_type(base::MessageLoop::Type type);
+
+  // Once the various parameters have been set above, use Run to initialize an
+  // ApplicationImpl wired to the provided delegate, and run a MessageLoop until
+  // the application exits.
+  //
+  // Iff |init_base| is true, the runner will perform some initialization of
+  // base globals (e.g. CommandLine and AtExitManager) before starting the
+  // application.
+  MojoResult Run(MojoHandle shell_handle, bool init_base);
+
+  // Calls Run above with |init_base| set to |true|.
+  MojoResult Run(MojoHandle shell_handle);
+
+ private:
+  scoped_ptr<ApplicationDelegate> delegate_;
+
+  // MessageLoop type. TYPE_CUSTOM is default (MessagePumpMojo will be used as
+  // the underlying message pump).
+  base::MessageLoop::Type message_loop_type_;
+  // Whether Run() has been called.
+  bool has_run_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(ApplicationRunner);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_SHELL_PUBLIC_CPP_APPLICATION_RUNNER_H_