Improve performance of registering font preferences

base/prefs/public/pref_service_base.h

 // 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.
 
 // This is the base interface for a preference services that provides
 // a way to access the application's current preferences.
 //
 // This base interface assumes all preferences are local.  See
 // SyncablePrefServiceBase for the interface to a preference service
 // that stores preferences that can be synced.
@@ skipping 143 matching lines @@
                                    PrefSyncStatus sync_status) = 0;
   virtual void RegisterIntegerPref(const char* path,
                                    int default_value,
                                    PrefSyncStatus sync_status) = 0;
   virtual void RegisterDoublePref(const char* path,
                                   double default_value,
                                   PrefSyncStatus sync_status) = 0;
   virtual void RegisterStringPref(const char* path,
                                   const std::string& default_value,
                                   PrefSyncStatus sync_status) = 0;
+  virtual void RegisterStringPrefIfNew(const char* path,
+                                       const std::string& default_value,
+                                       PrefSyncStatus sync_status) = 0;
   virtual void RegisterFilePathPref(const char* path,
                                     const FilePath& default_value,
                                     PrefSyncStatus sync_status) = 0;
   virtual void RegisterListPref(const char* path,
                                 PrefSyncStatus sync_status) = 0;
   virtual void RegisterDictionaryPref(const char* path,
                                       PrefSyncStatus sync_status) = 0;
   // These take ownership of the default_value:
   virtual void RegisterListPref(const char* path,
                                 base::ListValue* default_value,
@@ skipping 89 matching lines @@
   // method with PREF_CHANGED. Note that observers should not call these methods
   // directly but rather use a PrefChangeRegistrar to make sure the observer
   // gets cleaned up properly.
   virtual void AddPrefObserver(const char* path,
                                content::NotificationObserver* obs) = 0;
   virtual void RemovePrefObserver(const char* path,
                                   content::NotificationObserver* obs) = 0;
 };
 
 #endif  // BASE_PREFS_PUBLIC_PREF_SERVICE_BASE_H_