Extract guts of ChromeStabilityMetricsProvider into helper class

components/metrics/metrics_pref_names.cc

Index: components/metrics/metrics_pref_names.cc
diff --git a/components/metrics/metrics_pref_names.cc b/components/metrics/metrics_pref_names.cc
index 187b9042aded82c0dc110b51c3580319f152f554..3cdebabaf175cdb9cbe90af4a9a2cc4951b72822 100644
--- a/components/metrics/metrics_pref_names.cc
+++ b/components/metrics/metrics_pref_names.cc
@@ -59,6 +59,12 @@ const char kStabilityBreakpadRegistrationSuccess[] =
 const char kStabilityBreakpadRegistrationFail[] =
     "user_experience_metrics.stability.breakpad_registration_fail";
 
+// Total number of child process crashes (other than renderer / extension
+// renderer ones, and plugin children, which are counted separately) since the
+// last report.
+const char kStabilityChildProcessCrashCount[] =
+    "user_experience_metrics.stability.child_process_crash_count";
+
 // Number of times the application exited uncleanly since the last report.
 const char kStabilityCrashCount[] =
     "user_experience_metrics.stability.crash_count";
@@ -79,6 +85,15 @@ const char kStabilityExecutionPhase[] =
 const char kStabilityExitedCleanly[] =
     "user_experience_metrics.stability.exited_cleanly";
 
+// 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 the session end did not complete.
 const char kStabilityIncompleteSessionEndCount[] =
     "user_experience_metrics.stability.incomplete_session_end_count";
@@ -96,6 +111,23 @@ const char kStabilityLaunchCount[] =
 const char kStabilityLaunchTimeSec[] =
     "user_experience_metrics.stability.launch_time_sec";
 
+// Number of times a page load event occurred since the last report.
+const char kStabilityPageLoadCount[] =
+    "user_experience_metrics.stability.page_load_count";
+
+// Number of times a renderer process crashed since the last report.
+const char kStabilityRendererCrashCount[] =
+    "user_experience_metrics.stability.renderer_crash_count";
+
+// 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";
+
 // Base64 encoded serialized UMA system profile proto from the previous session.
 const char kStabilitySavedSystemProfile[] =
     "user_experience_metrics.stability.saved_system_profile";
@@ -123,6 +155,8 @@ const char kStabilityStatsVersion[] =
 // a chrome installation. They are (optionally) sent up to the uninstall
 // survey in the event of uninstallation.
 const char kUninstallLaunchCount[] = "uninstall_metrics.launch_count";
+const char kUninstallMetricsPageLoadCount[] =
+    "uninstall_metrics.page_load_count";
 const char kUninstallMetricsUptimeSec[] = "uninstall_metrics.uptime_sec";
 
 }  // namespace prefs