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

chrome/browser/chromeos/preferences.cc

 // Copyright (c) 2012 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/chromeos/preferences.h"
 
 #include <vector>
 
 #include "ash/autoclick/autoclick_controller.h"
 #include "ash/shell.h"
@@ skipping 274 matching lines @@
       prefs::kShowPlanNotifications,
       true,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 
   // 3G first-time usage promo will be shown at least once.
   registry->RegisterBooleanPref(
       prefs::kShow3gPromoNotification,
       true,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 
+  // Number of times Data Saver prompt has been shown on 3G data network.
+  registry->RegisterIntegerPref(
+      prefs::kDataSaverPromptsShown,
+      0,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+
   // Initially all existing users would see "What's new" for current version
   // after update.
   registry->RegisterStringPref(prefs::kChromeOSReleaseNotesVersion,
                                "0.0.0.0",
                                user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
 
   registry->RegisterBooleanPref(
       prefs::kExternalStorageDisabled,
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
@@ skipping 423 matching lines @@
   touch_hud_projection_enabled_.SetValue(enabled);
 }
 
 void Preferences::ActiveUserChanged(const user_manager::User* active_user) {
   if (active_user != user_)
     return;
   ApplyPreferences(REASON_ACTIVE_USER_CHANGED, "");
 }
 
 }  // namespace chromeos