Quantify initial stability report edge cases.

components/metrics/metrics_pref_names.h

Index: components/metrics/metrics_pref_names.h
diff --git a/components/metrics/metrics_pref_names.h b/components/metrics/metrics_pref_names.h
index 92ccf7aaf51b8537b33a800c21aa6b082ce83806..9cb2bbe2e1824144166060b9ea819548fafa44b4 100644
--- a/components/metrics/metrics_pref_names.h
+++ b/components/metrics/metrics_pref_names.h
@@ -34,6 +34,8 @@ extern const char kStabilityChildProcessCrashCount[];
 extern const char kStabilityCrashCount[];
 extern const char kStabilityDebuggerPresent[];
 extern const char kStabilityDebuggerNotPresent[];
+extern const char kStabilityDeferredCount[];
+extern const char kStabilityDiscardCount[];
 extern const char kStabilityExecutionPhase[];
 extern const char kStabilityExtensionRendererCrashCount[];
 extern const char kStabilityExtensionRendererFailedLaunchCount[];
@@ -53,6 +55,7 @@ extern const char kStabilitySavedSystemProfileHash[];
 extern const char kStabilitySessionEndCompleted[];
 extern const char kStabilityStatsBuildTime[];
 extern const char kStabilityStatsVersion[];
+extern const char kStabilityVersionMismatchCount[];
 extern const char kUninstallLaunchCount[];
 extern const char kUninstallMetricsPageLoadCount[];
 extern const char kUninstallMetricsUptimeSec[];