Restrict sending GWS ID only to signed in users

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 <deque>
 #include <memory>
 
@@ skipping 60 matching lines @@
   // to move this, ExternalDataUseObserverBridge needs to hold a pointer to
   // ExternalDataUseReporter. This is currently not doable, since this creates
   // a circular dependency between ExternalDataUseReporter, DataUseTabModel and
   // ExternalDataUseObserverBridge, which creates issues during desctruction.
   void OnReportDataUseDone(bool success);
 
   ExternalDataUseReporter* GetExternalDataUseReporterForTesting() const {
     return external_data_use_reporter_;
   }
 
+  void SetRegisterGoogleVariationID(bool register_google_variation_id);
+
  private:
   friend class DataUseTabModelTest;
   friend class DataUseUITabModelTest;
   friend class ExternalDataUseObserverTest;
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest,
                            MatchingRuleFetchOnControlAppInstall);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest,
                            PeriodicFetchMatchingRules);
   FRIEND_TEST_ALL_PREFIXES(ExternalDataUseObserverTest,
                            RegisteredAsDataUseObserver);
@@ skipping 47 matching lines @@
   base::WeakPtrFactory<ExternalDataUseObserver> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExternalDataUseObserver);
 };
 
 }  // namespace android
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_DATA_USAGE_EXTERNAL_DATA_USE_OBSERVER_H_