Consolidate RecordBrowserStartupTime() into one location

base/process_info_mac.cc

+// 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.
+
+#include "base/process_info.h"
+
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/time.h"
+
+namespace {
+
+using base::Time;
+
+// Returns the process creation time, or NULL if an error occurred.
+Time* ProcessCreationTimeInternal() {
+  int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid() };
+  size_t len = 0;
+  if (sysctl(mib, arraysize(mib), NULL, &len, NULL, 0) < 0)
+    return NULL;
+
+  scoped_ptr_malloc<struct kinfo_proc>
+      proc(static_cast<struct kinfo_proc*>(malloc(len)));
+  if (sysctl(mib, arraysize(mib), proc.get(), &len, NULL, 0) < 0)
+    return NULL;
+  return new Time(Time::FromTimeVal(proc->kp_proc.p_un.__p_starttime));
+}
+
+}  // namespace
+
+namespace base {
+
+//static
+const Time* CurrentProcessInfo::CreationTime() {
+  static Time* process_creation_time = ProcessCreationTimeInternal();
+  return process_creation_time;
+}
+
+}  // namespace base