Fix race with google variation ID registration

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 3c4b7c219aa227f8e601c7d70223e05880dbd859..c1e4d57e6f0aa924492862f5adb6b294e1dc2be8 100644
--- a/chrome/browser/android/data_usage/external_data_use_observer.h
+++ b/chrome/browser/android/data_usage/external_data_use_observer.h
@@ -78,7 +78,7 @@ class ExternalDataUseObserver : public data_usage::DataUseAggregator::Observer {
     return external_data_use_reporter_;
   }
 
-  void SetRegisterGoogleVariationID(bool register_google_variation_id);
+  void SetProfileSigninStatus(bool signin_status);
 
  private:
   friend class DataUseTabModelTest;
@@ -135,6 +135,9 @@ class ExternalDataUseObserver : public data_usage::DataUseAggregator::Observer {
   // True if |this| is currently registered as a data use observer.
   bool registered_as_data_use_observer_;
 
+  // True if profile is signed in and authenticated.
+  bool profile_signin_status_;
+
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<ExternalDataUseObserver> weak_factory_;