Analyze and record Windows system crashes on browser crash.

Bug: 799526
Change-Id: Ie61ff4ada2c1ed57949414c0c400ea93481a68c5
Reviewed-on: https://chromium-review.googlesource.com/897904
Commit-Queue: Sigurður Ásgeirsson <[email protected]>
Reviewed-by: Robert Kaplow <[email protected]>
Cr-Commit-Position: refs/heads/master@{#534149}
diff --git a/components/metrics/metrics_pref_names.cc b/components/metrics/metrics_pref_names.cc
index 1d344cf..5dcb253 100644
--- a/components/metrics/metrics_pref_names.cc
+++ b/components/metrics/metrics_pref_names.cc
@@ -193,6 +193,12 @@
 const char kStabilityStatsVersion[] =
     "user_experience_metrics.stability.stats_version";
 
+// Number of times the application exited uncleanly and the system session
+// embedding the browser session ended abnormally since the last report.
+// Windows only.
+const char kStabilitySystemCrashCount[] =
+    "user_experience_metrics.stability.system_crash_count";
+
 // Number of times the version number stored in prefs did not match the
 // serialized system profile version number.
 const char kStabilityVersionMismatchCount[] =