Re-sort preference update protocol between Chrome and ArcSupport.

chrome/browser/chromeos/arc/arc_support_host.h

 // Copyright 2016 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_CHROMEOS_ARC_ARC_SUPPORT_HOST_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_SUPPORT_HOST_H_
 
 #include "base/macros.h"
 #include "chrome/browser/chromeos/arc/arc_auth_service.h"
 #include "components/prefs/pref_change_registrar.h"
@@ skipping 34 matching lines @@
   void OnDisplayMetricsChanged(const display::Display& display,
                                uint32_t changed_metrics) override;
 
  private:
   ArcSupportHost();
 
   bool Initialize();
   void OnMetricsPreferenceChanged();
   void OnBackupAndRestorePreferenceChanged();
   void OnLocationServicePreferenceChanged();
+
+  // Utilities on preference update.
   void SendMetricsMode();
   void SendBackupAndRestoreMode();
   void SendLocationServicesMode();
   void SendOptionMode(const std::string& action_name,
                       const std::string& pref_name);
+
+  // Sends a preference update to the extension.
+  // The message will be
+  // {
+  //   'action': action_name,
+  //   'enabled': is_enabled,
+  //   'managed': is_managed
+  // }
+  void SendPreferenceUpdate(const std::string& action_name,
+                            bool is_enabled,
+                            bool is_managed);
+
   void EnableMetrics(bool is_enabled);
   void EnableBackupRestore(bool is_enabled);
   void EnableLocationService(bool is_enabled);
 
   // Unowned pointer.
   Client* client_ = nullptr;
 
   // Keep if Close() is requested from the browser.
   // TODO(hidehiko): Remove this. This is temporarily introduced for checking
   // if ArcAuthService::CancelAuthCode() needs to be invoked or not.
   // ArcAuthService should know its own state and the transition so moving to
   // there should simplify the structure. However, it is blocked by the current
   // dependency. For the clean up, more refactoring is needed, which can be
   // bigger changes.
   bool close_requested_ = false;
 
   // Used to track metrics preference.
   PrefChangeRegistrar pref_local_change_registrar_;
   // Used to track backup&restore and location service preference.
   PrefChangeRegistrar pref_change_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcSupportHost);
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_SUPPORT_HOST_H_