Move launchd code from chrome/browser/mac to base/mac.

base/mac/launchd.h

+// Copyright (c) 2012 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 BASE_MAC_LAUNCHD_H_
+#define BASE_MAC_LAUNCHD_H_
+#pragma once
+
+#include <launch.h>
+#include <sys/types.h>
+
+#include <string>
+
+namespace base {
+namespace mac {
+
+// MessageForJob sends a single message to launchd with a simple dictionary
+// mapping |operation| to |job_label|, and returns the result of calling
+// launch_msg to send that message. On failure, returns NULL. The caller
+// assumes ownership of the returned launch_data_t object.
+launch_data_t MessageForJob(const std::string& job_label,
+                            const char* operation);
+
+// Returns the process ID for |job_label| if the job is running, 0 if the job
+// is loaded but not running, or -1 on error.
+pid_t PIDForJob(const std::string& job_label);
+
+}  // namespace mac
+}  // namespace base
+
+#endif  // BASE_MAC_LAUNCHD_H_