Notify DataUseTabModel of navigations and tab closures

chrome/browser/android/data_usage/external_data_use_observer.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_DATA_USAGE_EXTERNAL_DATA_USE_OBSERVER_H_
 #define CHROME_BROWSER_ANDROID_DATA_USAGE_EXTERNAL_DATA_USE_OBSERVER_H_
 
 #include <jni.h>
 #include <stdint.h>
 
@@ skipping 73 matching lines @@
   // called on a different thread. |success| is true if the request was
   // successfully submitted to the external data use observer by Java. Must be
   // called on UI thread.
   void OnReportDataUseDone(JNIEnv* env, jobject obj, bool success);
 
   // Returns true if the |gurl| matches the registered regular expressions.
   // |label| must not be null. If a match is found, the |label| is set to the
   // 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);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, MultipleRegex);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, ChangeRegex);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest,
                            AtMostOneDataUseSubmitRequest);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, MultipleMatchingRules);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, ReportsMergedCorrectly);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest,
                            TimestampsMergedCorrectly);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, HashFunction);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest, BufferSize);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest,
                            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 {
     DataUseReportKey(const std::string& label,
                      net::NetworkChangeNotifier::ConnectionType connection_type,
                      const std::string& mcc_mnc);
 
     bool operator==(const DataUseReportKey& other) const;
 
     // Label provided by the matching rules.
@@ skipping 195 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(ExternalDataUseObserver);
 };
 
 bool RegisterExternalDataUseObserver(JNIEnv* env);
 
 }  // namespace android
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_DATA_USAGE_EXTERNAL_DATA_USE_OBSERVER_H_