Add UMA histograms for data usage tab model

chrome/browser/android/data_usage/tab_data_use_entry.h

Index: chrome/browser/android/data_usage/tab_data_use_entry.h
diff --git a/chrome/browser/android/data_usage/tab_data_use_entry.h b/chrome/browser/android/data_usage/tab_data_use_entry.h
index 86dbf5a7f70f69b27efa0964021bfe2661d4ba15..92abf391067f2b3e05e2ed42316630d28fab6c44 100644
--- a/chrome/browser/android/data_usage/tab_data_use_entry.h
+++ b/chrome/browser/android/data_usage/tab_data_use_entry.h
@@ -84,6 +84,12 @@ class TabDataUseEntry {
   FRIEND_TEST_ALL_PREFIXES(TabDataUseEntryTest, MultipleTabSessionCloseEvent);
   FRIEND_TEST_ALL_PREFIXES(DataUseTabModelTest, TabCloseEvent);
   FRIEND_TEST_ALL_PREFIXES(MockTabDataUseEntryTest, CompactTabSessionHistory);
+  FRIEND_TEST_ALL_PREFIXES(MockTabDataUseEntryTest,
+                           OldInactiveSessionRemovaltimeHistogram);
+  FRIEND_TEST_ALL_PREFIXES(MockDataUseTabModelTest,
+                           ExpiredInactiveTabEntryRemovaltimeHistogram);
+  FRIEND_TEST_ALL_PREFIXES(MockDataUseTabModelTest,
+                           ExpiredActiveTabEntryRemovaltimeHistogram);
 
   typedef std::deque<TabDataUseTrackingSession> TabSessions;