Histogram appcache task queue and run times.

webkit/appcache/appcache_histograms.cc

Index: webkit/appcache/appcache_histograms.cc
===================================================================
--- webkit/appcache/appcache_histograms.cc	(revision 110360)
+++ webkit/appcache/appcache_histograms.cc	(working copy)
@@ -23,4 +23,28 @@
        result, NUM_CHECK_RESPONSE_RESULT_TYPES);
 }
 
+// static
+void AppCacheHistograms::AddTaskQueueTimeSample(
+    const base::TimeDelta& duration) {
+  UMA_HISTOGRAM_TIMES("appcache.TaskQueueTime", duration);
+}
+
+// static
+void AppCacheHistograms::AddTaskRunTimeSample(
+    const base::TimeDelta& duration) {
+  UMA_HISTOGRAM_TIMES("appcache.TaskRunTime", duration);
+}
+
+// static
+void AppCacheHistograms::AddTaskCompletionTimeSample(
+      const base::TimeDelta& duration) {
+  UMA_HISTOGRAM_TIMES("appcache.TaskCompletionTime", duration);
+}
+
+// static
+void AppCacheHistograms::AddTaskCompletionRunTimeSample(
+      const base::TimeDelta& duration) {
+  UMA_HISTOGRAM_TIMES("appcache.TaskCompletionRunTime", duration);
+}
+
 }  // namespace appcache