Add renderer launch count to stability metrics.

components/metrics/metrics_pref_names.cc

 // Copyright 2014 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 "components/metrics/metrics_pref_names.h"
 
 namespace metrics {
 namespace prefs {
 
 // Set once, to the current epoch time, on the first run of chrome on this
@@ skipping 93 matching lines @@
 
 // Number of times an extension renderer process crashed since the last report.
 const char kStabilityExtensionRendererCrashCount[] =
     "user_experience_metrics.stability.extension_renderer_crash_count";
 
 // Number of times an extension renderer process failed to launch since the last
 // report.
 const char kStabilityExtensionRendererFailedLaunchCount[] =
     "user_experience_metrics.stability.extension_renderer_failed_launch_count";
 
+// Number of times an extension renderer process successfully launched since the
+// last report.
+const char kStabilityExtensionRendererLaunchCount[] =
+    "user_experience_metrics.stability.extension_renderer_launch_count";
+
 // Number of times the session end did not complete.
 const char kStabilityIncompleteSessionEndCount[] =
     "user_experience_metrics.stability.incomplete_session_end_count";
 
 // Time when the app was last known to be running, in seconds since
 // the epoch.
 const char kStabilityLastTimestampSec[] =
     "user_experience_metrics.stability.last_timestamp_sec";
 
 // Number of times the application was launched since last report.
@@ skipping 14 matching lines @@
 
 // Number of times a renderer process failed to launch since the last report.
 const char kStabilityRendererFailedLaunchCount[] =
     "user_experience_metrics.stability.renderer_failed_launch_count";
 
 // Number of times the renderer has become non-responsive since the last
 // report.
 const char kStabilityRendererHangCount[] =
     "user_experience_metrics.stability.renderer_hang_count";
 
+// Number of times a renderer process successfully launched since the last
+// report.
+const char kStabilityRendererLaunchCount[] =
+    "user_experience_metrics.stability.renderer_launch_count";
+
 // Base64 encoded serialized UMA system profile proto from the previous session.
 const char kStabilitySavedSystemProfile[] =
     "user_experience_metrics.stability.saved_system_profile";
 
 // SHA-1 hash of the serialized UMA system profile proto (hex encoded).
 const char kStabilitySavedSystemProfileHash[] =
     "user_experience_metrics.stability.saved_system_profile_hash";
 
 // False if we received a session end and either we crashed during processing
 // the session end or ran out of time and windows terminated us.
@@ skipping 21 matching lines @@
 // Dictionary for measuring cellular data used by UMA service during last 7
 // days.
 const char kUmaCellDataUse[] = "user_experience_metrics.uma_cell_datause";
 
 // Dictionary for measuring cellular data used by user including chrome services
 // per day.
 const char kUserCellDataUse[] = "user_experience_metrics.user_call_datause";
 
 }  // namespace prefs
 }  // namespace metrics