Notify DataUseTabModel of navigations and tab closures

chrome/browser/android/data_usage/external_data_use_observer.cc

 // 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.
 
 #include "chrome/browser/android/data_usage/external_data_use_observer.h"
 
 #include <utility>
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_string.h"
@@ skipping 398 matching lines @@
   for (const auto& matching_rule : matching_rules_) {
     if (app_package_name == matching_rule->app_package_name()) {
       *label = matching_rule->label();
       return true;
     }
   }
 
   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,
     const std::string& mcc_mnc)
     : label(label), connection_type(connection_type), mcc_mnc(mcc_mnc) {}
 
 bool ExternalDataUseObserver::DataUseReportKey::operator==(
     const DataUseReportKey& other) const {
   return label == other.label && connection_type == other.connection_type &&
          mcc_mnc == other.mcc_mnc;
@@ skipping 49 matching lines @@
   return label_;
 }
 
 bool RegisterExternalDataUseObserver(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 
 }  // namespace chrome