Notify DataUseTabModel of navigations and tab closures

chrome/browser/android/data_usage/external_data_use_observer.cc

Index: chrome/browser/android/data_usage/external_data_use_observer.cc
diff --git a/chrome/browser/android/data_usage/external_data_use_observer.cc b/chrome/browser/android/data_usage/external_data_use_observer.cc
index 55774278b8b6fc688fa719175cc956bec917d4cd..f8741df23d317ab0830e4927dc6a6f80cce71f27 100644
--- a/chrome/browser/android/data_usage/external_data_use_observer.cc
+++ b/chrome/browser/android/data_usage/external_data_use_observer.cc
@@ -416,6 +416,11 @@ bool ExternalDataUseObserver::MatchesAppPackageName(
   return false;
 }
 
+DataUseTabModel* ExternalDataUseObserver::GetDataUseTabModel() const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  return data_use_tab_model_.get();
+}
+
 ExternalDataUseObserver::DataUseReportKey::DataUseReportKey(
     const std::string& label,
     net::NetworkChangeNotifier::ConnectionType connection_type,