Add CurrentProcessInfo::CreationTime() for Linux

base/process/process_info_linux.cc

+// 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.
+
+#include "base/process/process_info.h"
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/process/internal_linux.h"
+#include "base/process/process_handle.h"
+#include "base/time/time.h"
+
+namespace base {
+
+//static
+const Time CurrentProcessInfo::CreationTime() {
+  ProcessHandle pid = GetCurrentProcessHandle();
+  int start_ticks = internal::ReadProcStatsAndGetFieldAsInt(
+      pid, internal::VM_STARTTIME);
+  DCHECK(start_ticks);
+  TimeDelta start_offset = internal::ClockTicksToTimeDelta(start_ticks);
+  Time boot_time = internal::GetBootTime();
+  DCHECK(!boot_time.is_null());
+  return Time(boot_time + start_offset);
+}
+
+}  // namespace base