Set up content in-process main threads via factory

content/utility/utility_main_thread.h

Index: content/utility/utility_main_thread.h
diff --git a/content/utility/utility_main_thread.h b/content/utility/utility_main_thread.h
new file mode 100644
index 0000000000000000000000000000000000000000..43e22b74a1aacc9beef393e8a51f17403586ebef
--- /dev/null
+++ b/content/utility/utility_main_thread.h
@@ -0,0 +1,40 @@
+// Copyright 2013 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 CONTENT_UTILITY_UTILITY_MAIN_THREAD_H_
+#define CONTENT_UTILITY_UTILITY_MAIN_THREAD_H_
+
+#include <string>
+
+#include "base/threading/thread.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+class ChildProcess;
+
+class UtilityMainThread : public base::Thread {
+ public:
+  UtilityMainThread(const std::string& channel_id);
+  virtual ~UtilityMainThread();
+ private:
+
+  // base::Thread implementation:
+  virtual void Init() OVERRIDE;
+  virtual void CleanUp() OVERRIDE;
+
+  void InitInternal();
+
+  std::string channel_id_;
+  scoped_ptr<ChildProcess> child_process_;
+
+  DISALLOW_COPY_AND_ASSIGN(UtilityMainThread);
+};
+
+CONTENT_EXPORT base::Thread* CreateUtilityMainThread(
+    const std::string& channel_id);
+
+}  // namespace content
+
+#endif  // CONTENT_UTILITY_UTILITY_MAIN_THREAD_H_