Add external data use observer

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 165bf37aaafac32b370109297fbcd70c6021dfa4..9fb8a4c65669900a171b13ceb67a930346dbd939 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -40,7 +40,6 @@
 #include "chrome/common/pref_names.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_prefs.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
-#include "components/data_usage/core/data_use_aggregator.h"
 #include "components/net_log/chrome_net_log.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/proxy_config/pref_proxy_config_tracker.h"
@@ -108,6 +107,7 @@
 
 #if defined(OS_ANDROID)
 #include "base/android/build_info.h"
+#include "chrome/browser/android/datausage/external_data_use_observer_android.h"
 #include "chrome/browser/android/net/external_estimate_provider_android.h"
 #endif
 
@@ -583,6 +583,12 @@ void IOThread::Init() {
       globals_->data_use_aggregator.get(),
       true /* is_data_usage_off_the_record */);
 
+#if defined(OS_ANDROID)
+  globals_->external_data_use_observer.reset(
+      new chrome::android::ExternalDataUseObserverAndroid(
+          globals_->data_use_aggregator.get()));
+#endif
+
   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
   // is fixed.
   tracked_objects::ScopedTracker tracking_profile4(