Add methods for determining which PrefStore contains a given preference, and ...

chrome/browser/pref_service.h

 // Copyright (c) 2010 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.
 
 // This provides a way to access the application's current preferences.
 
 #ifndef CHROME_BROWSER_PREF_SERVICE_H_
 #define CHROME_BROWSER_PREF_SERVICE_H_
 
 #include <set>
@@ skipping 34 matching lines @@
     // browser.window_placement).
     const std::wstring name() const { return name_; }
 
     // Returns the value of the Preference.  If there is no user specified
     // value, it returns the default value.
     const Value* GetValue() const;
 
     // Returns true if the current value matches the default value.
     bool IsDefaultValue() const;
 
-    // Returns true if the Preference is managed, i.e. not changeable
-    // by the user.
+    // Returns true if the Preference is managed, i.e. set by an admin policy.
+    // Since managed prefs have the highest priority, this also indicates
+    // whether the pref is actually being controlled by the policy setting.
     bool IsManaged() const;
 
+    // Returns true if the Preference has a value set by an extension, even if
+    // that value is being overridden by a higher-priority source.
+    bool HasExtensionSetting() const;
+
+    // Returns true if the Preference has a user setting, even if that value is
+    // being overridden by a higher-priority source.
+    bool HasUserSetting() const;
+
+    // Returns true if the Preference value is currently being controlled by an
+    // extension, and not by any higher-priority source.
+    bool IsExtensionControlled() const;
+
+    // Returns true if the Preference value is currently being controlled by a
+    // user setting, and not by any higher-priority source.
+    bool IsUserControlled() const;
+
    private:
     friend class PrefService;
 
     Value::ValueType type_;
     std::wstring name_;
     scoped_ptr<Value> default_value_;
 
     // A reference to the pref service's pref_value_store_.
     PrefValueStore* pref_value_store_;
 
@@ skipping 170 matching lines @@
   typedef base::hash_map<std::wstring, NotificationObserverList*>
       PrefObserverMap;
   PrefObserverMap pref_observers_;
 
   friend class ScopedPrefUpdate;
 
   DISALLOW_COPY_AND_ASSIGN(PrefService);
 };
 
 #endif  // CHROME_BROWSER_PREF_SERVICE_H_