Added a metric for tracking non-zero TPM dictionary-attack counters.

BUG=chromium:341358
TEST=manual

Change-Id: I99d3e4279c6d9185b9b515259d4fe511e0d79874
Reviewed-on: https://chromium-review.googlesource.com/185493
Reviewed-by: Luigi Semenzato <semenzato@chromium.org>
Commit-Queue: Darren Krahn <dkrahn@chromium.org>
Tested-by: Darren Krahn <dkrahn@chromium.org>

metrics/metrics_library.cc

@@ -45,6 +45,7 @@ static const char *kCrosEventNames[] = {
   "SpringPowerSupply.Other.High",  // 8
   "SpringPowerSupply.Original.Low",  // 9
   "SpringPowerSupply.ChargerIdle",  // 10
+  "TPM.NonZeroDictionaryAttackCounter",  // 11
 };
 
 time_t MetricsLibrary::cached_enabled_time_ = 0;