Initial CL for Data Saver (Flywheel) prompt when cellular network detected

chrome/browser/chromeos/status/data_promo_notification.h

Index: chrome/browser/chromeos/status/data_promo_notification.h
diff --git a/chrome/browser/chromeos/status/data_promo_notification.h b/chrome/browser/chromeos/status/data_promo_notification.h
index def5e8e6135d968df0063d2ecb1094e80f6ca2d6..3dae8d9b9daf4dc7573689bdf0a8314e619355ac 100644
--- a/chrome/browser/chromeos/status/data_promo_notification.h
+++ b/chrome/browser/chromeos/status/data_promo_notification.h
@@ -37,9 +37,11 @@ class DataPromoNotification : public NetworkStateHandlerObserver {
   // Shows 3G promo notification if needed.
   void ShowOptionalMobileDataPromoNotification();
 
-  // True if check for promo needs to be done, otherwise ignore it for the
-  // current session.
-  bool check_for_promo_;
+  // Show notification prompting user to install Data Saver extension.
+  bool ShowDataSaverNotification();
+
+  // True if we've shown notifications during this session, won't show again.
+  bool notifications_shown_;
 
   // Factory for delaying showing promo notification.
   base::WeakPtrFactory<DataPromoNotification> weak_ptr_factory_;