metrics: Send ability to notify chrome of system crashes

Change-Id: I11df903c020141a8123055620f9ad23fedc06c7d

BUG=9352
TEST=
1) UserCrash
2) Crash random process and verify Chrome indicates "other user" crashes
occurred in its stability UMA data.

Review URL: http://codereview.chromium.org/6211001
diff --git a/metrics/c_metrics_library.h b/metrics/c_metrics_library.h
index 9500aad..5c7003d 100644
--- a/metrics/c_metrics_library.h
+++ b/metrics/c_metrics_library.h
@@ -32,6 +32,10 @@
 int CMetricsLibrarySendUserActionToUMA(CMetricsLibrary handle,
                                        const char* action);
 
+// C wrapper for MetricsLibrary::SendCrashToUMA.
+int CMetricsLibrarySendCrashToUMA(CMetricsLibrary handle,
+                                  const char* crash_kind);
+
 // C wrapper for MetricsLibrary::AreMetricsEnabled.
 int CMetricsLibraryAreMetricsEnabled(CMetricsLibrary handle);