Take 2: sync changes to support encryption

chrome/browser/sync/engine/update_applicator.h

 // Copyright (c) 2009 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.
 //
 // An UpdateApplicator is used to iterate over a number of unapplied updates,
 // applying them to the client using the given syncer session.
 //
 // UpdateApplicator might resemble an iterator, but it actually keeps retrying
 // failed updates until no remaining updates can be successfully applied.
 
 #ifndef CHROME_BROWSER_SYNC_ENGINE_UPDATE_APPLICATOR_H_
 #define CHROME_BROWSER_SYNC_ENGINE_UPDATE_APPLICATOR_H_
 
 #include <set>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/port.h"
 #include "chrome/browser/sync/engine/model_safe_worker.h"
 #include "chrome/browser/sync/syncable/syncable.h"
 
 namespace browser_sync {
 
 namespace sessions {
 class ConflictProgress;
 class UpdateProgress;
 }
 
 class ConflictResolver;
+class Cryptographer;
 
 class UpdateApplicator {
  public:
   typedef syncable::Directory::UnappliedUpdateMetaHandles::iterator
       UpdateIterator;
 
   UpdateApplicator(ConflictResolver* resolver,
+                   Cryptographer* cryptographer,
                    const UpdateIterator& begin,
                    const UpdateIterator& end,
                    const ModelSafeRoutingInfo& routes,
                    ModelSafeGroup group_filter);
 
   // returns true if there's more we can do.
   bool AttemptOneApplication(syncable::WriteTransaction* trans);
   // return true if we've applied all updates.
   bool AllUpdatesApplied() const;
 
   // This class does not automatically save its progress into the
   // SyncSession -- to get that to happen, call this method after update
   // application is finished (i.e., when AttemptOneAllocation stops returning
   // true).
   void SaveProgressIntoSessionState(
       sessions::ConflictProgress* conflict_progress,
       sessions::UpdateProgress* update_progress);
 
  private:
   // If true, AttemptOneApplication will skip over |entry| and return true.
   bool SkipUpdate(const syncable::Entry& entry);
 
   // Adjusts the UpdateIterator members to move ahead by one update.
   void Advance();
 
   // Used to resolve conflicts when trying to apply updates.
   ConflictResolver* const resolver_;
 
+  // Used to decrypt sensitive sync nodes.
+  Cryptographer* cryptographer_;
+
   UpdateIterator const begin_;
   UpdateIterator end_;
   UpdateIterator pointer_;
   ModelSafeGroup group_filter_;
   bool progress_;
 
   const ModelSafeRoutingInfo routing_info_;
 
   // Track the result of the various items.
   std::vector<syncable::Id> conflicting_ids_;
   std::vector<syncable::Id> successful_ids_;
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_UPDATE_APPLICATOR_H_