Added cros event name for attestation metric.

BUG=chromium:260504
TEST=unit

Change-Id: If1c7218a02bd6bac8193c4ac550866b06b475f2a
Reviewed-on: https://gerrit.chromium.org/gerrit/63495
Reviewed-by: Gaurav Shah <gauravsh@chromium.org>
Tested-by: Darren Krahn <dkrahn@chromium.org>
Commit-Queue: Darren Krahn <dkrahn@chromium.org>
diff --git a/metrics_library.cc b/metrics_library.cc
index 12ad226..de2ff93 100644
--- a/metrics_library.cc
+++ b/metrics_library.cc
@@ -40,6 +40,7 @@
   "Chaps.DatabaseCorrupted",  // 3
   "Chaps.DatabaseRepairFailure",  // 4
   "Chaps.DatabaseCreateFailure",  // 5
+  "Attestation.OriginSpecificExhausted",  // 6
 };
 
 time_t MetricsLibrary::cached_enabled_time_ = 0;