Record first run startup metrics.

chrome/common/startup_metric_utils.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 CHROME_COMMON_STARTUP_METRIC_UTILS_H_
 #define CHROME_COMMON_STARTUP_METRIC_UTILS_H_
 
 #include <string>
 
 #include "base/time.h"
@@ skipping 14 matching lines @@
 // in comparison with UI display that it's OK to call it on every
 // UI invocation regardless of whether the browser window has already
 // been displayed or not.
 void SetNonBrowserUIDisplayed();
 
 // Call this as early as possible in the startup process to record a
 // timestamp.
 void RecordMainEntryPointTime();
 
 // Called just before the message loop is about to start. Entry point to record
-// startup stats.
-void OnBrowserStartupComplete();
+// startup stats (split into different stats based on |is_first_run|).

[jeremy, 2013/05/05 12:35:56]

Don't think the comment needs updating.

[gab, 2013/05/06 16:19:54]

Done (still added what is_first_run is, keeping the same format as in
chrome_browser_main.h).

+void OnBrowserStartupComplete(bool is_first_run);
 
 // Called when the initial page load has finished in order to record startup
 // stats.
 void OnInitialPageLoadComplete();
 
 // Scoper that records the time period before it's destructed in a histogram
 // with the given name. The histogram is only recorded for slow chrome startups.
 // Useful for trying to figure out what parts of Chrome cause slow startup.
 class ScopedSlowStartupUMA {
  public:
   explicit ScopedSlowStartupUMA(const std::string& histogram_name)
       : start_time_(base::TimeTicks::Now()),
         histogram_name_(histogram_name) {}
 
   ~ScopedSlowStartupUMA();
 
  private:
   const base::TimeTicks start_time_;
   const std::string histogram_name_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedSlowStartupUMA);
 };
 
 }  // namespace startup_metric_utils
 
 #endif  // CHROME_COMMON_STARTUP_METRIC_UTILS_H_