Consolidate RecordBrowserStartupTime() into one location

chrome/browser/chrome_browser_main.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 "chrome/browser/chrome_browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
+#include "base/process_info.h"
 #include "base/process_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_piece.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/sys_string_conversions.h"
 #include "base/threading/platform_thread.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
@@ skipping 1965 matching lines @@
 }
 
 // Public members:
 
 void ChromeBrowserMainParts::AddParts(ChromeBrowserMainExtraParts* parts) {
   chrome_extra_parts_.push_back(parts);
 }
 
 // Misc ------------------------------------------------------------------------
 
+void RecordBrowserStartupTime() {
+// CurrentProcessInfo::CreationTime() is currently only implemented on Mac and
+// Windows.
+#if defined(OS_MACOSX) || defined(OS_WIN)
+  const base::Time *process_creation_time =
+      base::CurrentProcessInfo::CreationTime();
+
+  if (!process_creation_time->is_null())
+    RecordPreReadExperimentTime("Startup.BrowserMessageLoopStartTime",
+        base::Time::Now() - *process_creation_time);
+#endif // OS_MACOSX || OS_WIN
+}
+
 // This code is specific to the Windows-only PreReadExperiment field-trial.
 void RecordPreReadExperimentTime(const char* name, base::TimeDelta time) {
   DCHECK(name != NULL);
 
   // This gets called with different histogram names, so we don't want to use
   // the UMA_HISTOGRAM_CUSTOM_TIMES macro--it uses a static variable, and the
   // first call wins.
   AddPreReadHistogramTime(name, time);
 
 #if defined(OS_WIN)
@@ skipping 12 matching lines @@
     if (base::win::GetVersion() <= base::win::VERSION_XP)
       uma_name += "_XP";
 
     uma_name += "_PreRead_";
     uma_name += pre_read_percentage;
     AddPreReadHistogramTime(uma_name.c_str(), time);
   }
 #endif
 #endif
 }