Add UMA stats for AppCacheUpdateJob results.

webkit/browser/appcache/appcache_histograms.cc

Index: webkit/browser/appcache/appcache_histograms.cc
diff --git a/webkit/browser/appcache/appcache_histograms.cc b/webkit/browser/appcache/appcache_histograms.cc
index dd00eb9c382847bf4f62b1da5dd3ecd4c2a3940a..dd98cb1757ae636a1fa0bace96c7087e4402e50b 100644
--- a/webkit/browser/appcache/appcache_histograms.cc
+++ b/webkit/browser/appcache/appcache_histograms.cc
@@ -29,6 +29,13 @@ void AppCacheHistograms::CountCheckResponseResult(
        result, NUM_CHECK_RESPONSE_RESULT_TYPES);
 }
 
+void AppCacheHistograms::CountUpdateJobResult(
+    AppCacheUpdateJob::ResultType result) {
+  UMA_HISTOGRAM_ENUMERATION(
+       "appcache.UpdateJobResult",
+       result, AppCacheUpdateJob::NUM_UPDATE_JOB_RESULT_TYPES);
+}
+
 void AppCacheHistograms::AddTaskQueueTimeSample(
     const base::TimeDelta& duration) {
   UMA_HISTOGRAM_TIMES("appcache.TaskQueueTime", duration);