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..c0b8b25ccd005a14625c1fa909f7bf9a5ebfb561 100644
--- a/chrome/browser/android/data_usage/tab_data_use_entry.h
+++ b/chrome/browser/android/data_usage/tab_data_use_entry.h
@@ -83,7 +83,13 @@ class TabDataUseEntry {
   FRIEND_TEST_ALL_PREFIXES(TabDataUseEntryTest, SingleTabSessionCloseEvent);
   FRIEND_TEST_ALL_PREFIXES(TabDataUseEntryTest, MultipleTabSessionCloseEvent);
   FRIEND_TEST_ALL_PREFIXES(DataUseTabModelTest, TabCloseEvent);
+  FRIEND_TEST_ALL_PREFIXES(DataUseTabModelTest,
+                           ExpiredInactiveTabEntryRemovaltimeHistogram);
+  FRIEND_TEST_ALL_PREFIXES(DataUseTabModelTest,
+                           ExpiredActiveTabEntryRemovaltimeHistogram);
   FRIEND_TEST_ALL_PREFIXES(MockTabDataUseEntryTest, CompactTabSessionHistory);
+  FRIEND_TEST_ALL_PREFIXES(MockTabDataUseEntryTest,
+                           OldInactiveSessionRemovaltimeHistogram);
 
   typedef std::deque<TabDataUseTrackingSession> TabSessions;