Replace the WAS_INSTALLED_BY_CUSTODIAN creation flag with a pref

chrome/browser/supervised_user/supervised_user_service.h

 // Copyright 2014 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_SUPERVISED_USER_SUPERVISED_USER_SERVICE_H_
 #define CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_SERVICE_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 284 matching lines @@
 #if defined(ENABLE_EXTENSIONS)
   // extensions::ManagementPolicy::Provider implementation:
   std::string GetDebugPolicyProviderName() const override;
   bool UserMayLoad(const extensions::Extension* extension,
                    base::string16* error) const override;
   bool UserMayModifySettings(const extensions::Extension* extension,
                              base::string16* error) const override;
   bool MustRemainInstalled(const extensions::Extension* extension,
                            base::string16* error) const override;
 
+  // An extension can be in one of the following states:
+  //
+  // FORCED: if it is installed by the custodian.
+  // ALLOWED: Components, Themes, Default extensions ..etc
+  //    are generally allowed.  Extensions that have been approved by the
+  //    custodian are also allowed.
+  // BLOCKED: if it is not ALLOWED or FORCED
+  //    and supervised users initiated installs are disabled.
+  enum ExtensionState {
+    EXTENSION_FORCED,
+    EXTENSION_BLOCKED,
+    EXTENSION_ALLOWED
+  };
+
+  // Returns the state of an extension whether being FORCED, BLOCK, or ALLOWED
+  // from the Supervised User service's point of view.
+  ExtensionState GetExtensionState(
+      const extensions::Extension* extension) const;
+
   // Extensions helper to SetActive().
   void SetExtensionsActive();
 #endif
 
   SupervisedUserSettingsService* GetSettingsService();
 
   size_t FindEnabledPermissionRequestCreator(size_t start);
   void AddPermissionRequestInternal(
       const CreatePermissionRequestCallback& create_request,
       const SuccessCallback& callback,
@@ skipping 98 matching lines @@
 
   base::ObserverList<SupervisedUserServiceObserver> observer_list_;
 
   // Prevents Sync from running until configuration is complete.
   std::unique_ptr<sync_driver::SyncSetupInProgressHandle> sync_blocker_;
 
   base::WeakPtrFactory<SupervisedUserService> weak_ptr_factory_;
 };
 
 #endif  // CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_SERVICE_H_