Add Startup.SameVersionStartupCount histogram

components/startup_metric_utils/browser/startup_metric_utils.h

 // 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.
 
 #ifndef COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_UTILS_H_
 #define COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_UTILS_H_
 
 #include <stdint.h>
 #include <string>
 
@@ skipping 71 matching lines @@
 void RecordBrowserMainMessageLoopStart(const base::TimeTicks& ticks,
                                        bool is_first_run);
 
 // Logs the Startup.TimeSinceLastStartup histogram. Obtains the timestamp of the
 // last startup from |pref_service| and overwrites it with the timestamp of the
 // current startup. If the startup temperature has been set by
 // RecordBrowserMainMessageLoopStart, the time since last startup is also logged
 // to an histogram suffixed with the startup temperature.
 void RecordTimeSinceLastStartup(PrefService* pref_service);
 
+// Logs the Startup.SameVersionStartupCount histogram. Relies on |pref_service|
+// to know information about the previous startups and store information for
+// future ones.
+void RecordStartupCount(PrefService* pref_service);
+
 // Call this with the time when the first browser window became visible.
 void RecordBrowserWindowDisplay(const base::TimeTicks& ticks);
 
 // Call this with the time delta that the browser spent opening its tabs.
 void RecordBrowserOpenTabsDelta(const base::TimeDelta& delta);
 
 // Call this with a renderer main entry time. The value provided for the first
 // call to this function is used to compute
 // Startup.LoadTime.BrowserMainToRendererMain. Further calls to this
 // function are ignored.
@@ skipping 21 matching lines @@
 base::TimeTicks MainEntryPointTicks();
 
 // Returns the startup type. This is only currently supported on the Windows
 // platform and will simply return UNCERTAIN_STARTUP_TYPE on other platforms.
 // This is only valid after a call to RecordBrowserMainMessageLoopStart().
 StartupTemperature GetStartupTemperature();
 
 }  // namespace startup_metric_utils
 
 #endif  // COMPONENTS_STARTUP_METRIC_UTILS_BROWSER_STARTUP_METRIC_UTILS_H_