Add probability of culling if sync is enabled to https://chromiumcodereview.appspot.com/9585020/ In…

chrome/browser/webdata/autocomplete_syncable_service.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.
 #ifndef CHROME_BROWSER_WEBDATA_AUTOCOMPLETE_SYNCABLE_SERVICE_H_
 #define CHROME_BROWSER_WEBDATA_AUTOCOMPLETE_SYNCABLE_SERVICE_H_
 #pragma once
 
 #include <map>
+#include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/sync/api/sync_change.h"
 #include "chrome/browser/sync/api/sync_data.h"
 #include "chrome/browser/sync/api/sync_error.h"
@@ skipping 67 matching lines @@
 
   // This is a helper map used only in Merge/Process* functions. The lifetime
   // of the iterator is longer than the map object. The bool in the pair is used
   // to indicate if the item needs to be added (true) or updated (false).
   typedef std::map<AutofillKey,
                   std::pair<SyncChange::SyncChangeType,
                             std::vector<AutofillEntry>::iterator> >
       AutocompleteEntryMap;
 
   // Creates or updates an autocomplete entry based on |data|.
+  // |data| -  an entry for sync.
+  // |loaded_data| - entries that were loaded from local storage.
+  // |new_entries| - entries that came from the sync.
+  // |ignored_entries| - entries that came from the sync, but too old to be
+  // stored and immediately discarded.
   void CreateOrUpdateEntry(const SyncData& data,
                            AutocompleteEntryMap* loaded_data,
-                           std::vector<AutofillEntry>* bundle);
+                           std::vector<AutofillEntry>* new_entries,
+                           std::vector<AutofillEntry>* ignored_entries);
 
   // Writes |entry| data into supplied |autofill_specifics|.
   static void WriteAutofillEntry(const AutofillEntry& entry,
                                  sync_pb::EntitySpecifics* autofill_specifics);
 
   // Deletes the database entry corresponding to the |autofill| specifics.
   SyncError AutofillEntryDelete(const sync_pb::AutofillSpecifics& autofill);
 
   SyncData CreateSyncData(const AutofillEntry& entry) const;
 
   // Syncs |changes| to the cloud.
   void ActOnChanges(const AutofillChangeList& changes);
 
   static std::string KeyToTag(const std::string& name,
                               const std::string& value);
 
   // For unit-tests.
   AutocompleteSyncableService();
   void set_sync_processor(SyncChangeProcessor* sync_processor) {
     sync_processor_.reset(sync_processor);
   }
 
+  // Ignore deletions of the following keys as they were never synced.
+  std::set<AutofillKey> keys_to_ignore_;
+
   // Lifetime of AutocompleteSyncableService object is shorter than
   // |web_data_service_| passed to it.
   WebDataService* web_data_service_;
   content::NotificationRegistrar notification_registrar_;
 
   // We receive ownership of |sync_processor_| in MergeDataAndStartSyncing() and
   // destroy it in StopSyncing().
   scoped_ptr<SyncChangeProcessor> sync_processor_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompleteSyncableService);
 };
 
 #endif  // CHROME_BROWSER_WEBDATA_AUTOCOMPLETE_SYNCABLE_SERVICE_H_