Notify DataUseTabModel of navigations and tab closures

chrome/browser/android/data_usage/external_data_use_observer.h

Index: chrome/browser/android/data_usage/external_data_use_observer.h
diff --git a/chrome/browser/android/data_usage/external_data_use_observer.h b/chrome/browser/android/data_usage/external_data_use_observer.h
index 5caa6208526299d8cb02637e4a92c9e600e1ef46..22d459cd0a902095eebaf3d31e9eb46c47c4a494 100644
--- a/chrome/browser/android/data_usage/external_data_use_observer.h
+++ b/chrome/browser/android/data_usage/external_data_use_observer.h
@@ -91,6 +91,10 @@ class ExternalDataUseObserver : public data_usage::DataUseAggregator::Observer {
   // matching rule's label.
   bool Matches(const GURL& gurl, std::string* label) const;
 
+  DataUseTabModel* data_use_tab_model() const {

[sclittle, 2015/11/16 23:13:43]

Why does this need to be exposed here?

[tbansal1, 2015/11/17 21:12:33]

It is called in io_thread.cc

+    return data_use_tab_model_.get();
+  }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, SingleRegex);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, TwoRegex);
@@ -108,6 +112,7 @@ class ExternalDataUseObserver : public data_usage::DataUseAggregator::Observer {
                            PeriodicFetchMatchingRules);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, BufferDataUseReports);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, Variations);
+  FRIEND_TEST_ALL_PREFIXES(DataUseUITabModelTest, ReportTabEventsTest);
 
   // DataUseReportKey is a unique identifier for a data use report.
   struct DataUseReportKey {