Consolidate RecordBrowserStartupTime() into one location

* Create a CurrentProcessInfo class as a central storage place for information about the current process.  For now store the process creation time there.
* Move RecordBrowserStartupTime() int browser_main.cc.

The motivation for this is that we will want to add some more UMA measurements which require knowledge of the process startup time.

BUG=None
Test=Chrome should continue to compile on all platforms.
TEST=


Review URL: https://chromiumcodereview.appspot.com/10561009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@142984 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 43 insertions, 0 deletions

diff --git a/base/process_info_mac.cc b/base/process_info_mac.cc
new file mode 100644
index 0000000..247a144
--- /dev/null
+++ b/base/process_info_mac.cc
@@ -0,0 +1,43 @@
+// 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