Add renderer launch count to stability metrics.

components/metrics/stability_metrics_helper.h

 // Copyright 2015 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_METRICS_STABILITY_METRICS_HELPER_H_
 #define COMPONENTS_METRICS_STABILITY_METRICS_HELPER_H_
 
 #include "base/macros.h"
 #include "base/metrics/user_metrics.h"
 #include "base/process/kill.h"
@@ skipping 18 matching lines @@
   // Clears the gathered stability metrics.
   void ClearSavedStabilityMetrics();
 
   // Records a browser child process crash.
   void BrowserChildProcessCrashed();
 
   // Logs the initiation of a page load.
   void LogLoadStarted();
 
   // Records a renderer process crash.
-  void LogRendererCrash(bool was_exception_process,
+  void LogRendererCrash(bool was_extension_process,
                         base::TerminationStatus status,
                         int exit_code);
 
+  // Records that a new renderer process was successfully launched.
+  void LogRendererLaunched(bool was_extension_process);
+
   // Records a renderer process hang.
   void LogRendererHang();
 
   // Registers local state prefs used by this class.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
  private:
   // Increment an Integer pref value specified by |path|.
   void IncrementPrefValue(const char* path);
 
   // Increment a 64-bit Integer pref value specified by |path|.
   void IncrementLongPrefsValue(const char* path);
 
   PrefService* local_state_;
 
   DISALLOW_COPY_AND_ASSIGN(StabilityMetricsHelper);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_STABILITY_METRICS_HELPER_H_