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diff --git a/mojo/shell/child_process.h b/mojo/shell/child_process.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 SHELL_CHILD_PROCESS_H_
+#define SHELL_CHILD_PROCESS_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
+
+namespace base {
+class CommandLine;
+}
+
+namespace mojo {
+namespace shell {
+
+// A base class for child processes -- i.e., code that is actually run within
+// the child process. (Instances are manufactured by |Create()|.)
+class ChildProcess {
+ public:
+  virtual ~ChildProcess();
+
+  // Returns null if the command line doesn't indicate that this is a child
+  // process. |main()| should call this, and if it returns non-null it should
+  // call |Main()| (without a message loop on the current thread).
+  static scoped_ptr<ChildProcess> Create(const base::CommandLine& command_line);
+
+  // To be implemented by subclasses. This is the "entrypoint" for a child
+  // process. Run with no message loop for the main thread.
+  virtual void Main() = 0;
+
+ protected:
+  ChildProcess();
+
+  embedder::ScopedPlatformHandle* platform_channel() {
+    return &platform_channel_;
+  }
+
+ private:
+  // Available in |Main()| (after a successful |Create()|).
+  embedder::ScopedPlatformHandle platform_channel_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChildProcess);
+};
+
+}  // namespace shell
+}  // namespace mojo
+
+#endif  // SHELL_CHILD_PROCESS_H_