Add UMA metrics and histograms for locally managed users.

chrome/browser/managed_mode/managed_mode_url_filter.cc

Index: chrome/browser/managed_mode/managed_mode_url_filter.cc
===================================================================
--- chrome/browser/managed_mode/managed_mode_url_filter.cc	(revision 177135)
+++ chrome/browser/managed_mode/managed_mode_url_filter.cc	(working copy)
@@ -7,6 +7,7 @@
 #include "base/file_path.h"
 #include "base/hash_tables.h"
 #include "base/json/json_file_value_serializer.h"
+#include "base/metrics/histogram.h"
 #include "base/sha1.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
@@ -306,6 +307,11 @@
     (*it)->GetAsString(&item);
     DVLOG(1) << item;
   }
+
+  UMA_HISTOGRAM_CUSTOM_COUNTS("ManagedMode.ManualWhitelistEntries",
+      url_manual_list_allow_->Size(), 1, 100, 50);
+  UMA_HISTOGRAM_CUSTOM_COUNTS("ManagedMode.ManualBlacklistEntries",
+      url_manual_list_block_->Size(), 1, 100, 50);
 }
 
 void ManagedModeURLFilter::AddURLPatternToManualList(