Create and remove sync nodes whenever preferences flip their managed flag

chrome/browser/sync/glue/preference_model_associator.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.
 
 #ifndef CHROME_BROWSER_SYNC_GLUE_PREFERENCE_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_SYNC_GLUE_PREFERENCE_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/pref_service.h"
 #include "chrome/browser/sync/glue/model_associator.h"
 #include "chrome/browser/sync/unrecoverable_error_handler.h"
 
 class ProfileSyncService;
 class Value;
 
 namespace sync_api {
 class WriteNode;
+class WriteTransaction;
 }
 
 namespace browser_sync {
 
 class PreferenceChangeProcessor;
 
 static const char kPreferencesTag[] = "google_chrome_preferences";
 
 // Contains all model association related logic:
 // * Algorithm to associate preferences model and sync model.
 class PreferenceModelAssociator
     : public PerDataTypeAssociatorInterface<PrefService::Preference,
                                             std::string> {
  public:
   static syncable::ModelType model_type() { return syncable::PREFERENCES; }
   explicit PreferenceModelAssociator(ProfileSyncService* sync_service);
   virtual ~PreferenceModelAssociator();
 
   // Returns the list of preference names that should be monitored for
   // changes.  Only preferences that are registered will be in this
   // list.
   const std::set<std::string>& synced_preferences() {
     return synced_preferences_;
   }
 
+  // Create an association for a given preference. A sync node is created if
+  // necessary and the value is read from or written to the node as appropriate.
+  bool InitPrefNodeAndAssociate(sync_api::WriteTransaction* trans,
+                                const sync_api::BaseNode& root,
+                                const PrefService::Preference* pref);
+
   // PerDataTypeAssociatorInterface implementation.
   //
   // Iterates through the sync model looking for matched pairs of items.
   virtual bool AssociateModels();
 
   // Clears all associations.
   virtual bool DisassociateModels();
 
   // Returns whether the sync model has nodes other than the permanent tagged
   // nodes.
@@ skipping 67 matching lines @@
 
   PreferenceNameToSyncIdMap id_map_;
   SyncIdToPreferenceNameMap id_map_inverse_;
 
   DISALLOW_COPY_AND_ASSIGN(PreferenceModelAssociator);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_PREFERENCE_MODEL_ASSOCIATOR_H_