sync: beginnings of MessageLoop based SyncerThread

chrome/browser/sync/engine/syncer.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_ENGINE_SYNCER_H_
 #define CHROME_BROWSER_SYNC_ENGINE_SYNCER_H_
 #pragma once
 
 #include <utility>
 #include <vector>
@@ skipping 61 matching lines @@
 // to SyncShare() may take an unbounded amount of time, as SyncerCommands
 // may block on network i/o, on lock contention, or on tasks posted to
 // other threads.
 class Syncer {
  public:
   typedef std::vector<int64> UnsyncedMetaHandles;
 
   // The constructor may be called from a thread that is not the Syncer's
   // dedicated thread, to allow some flexibility in the setup.
   Syncer();
-  ~Syncer();
+  virtual ~Syncer();
 
   // Called by other threads to tell the syncer to stop what it's doing
   // and return early from SyncShare, if possible.
   bool ExitRequested();
   void RequestEarlyExit();
 
   // Cause one sync cycle to occur.  Like a good parent, it is the caller's
   // responsibility to clean up after the syncer when it finishes a sync share
   // operation and honor server mandated throttles.
-  void SyncShare(sessions::SyncSession* session);
+  virtual void SyncShare(sessions::SyncSession* session);
 
   // Limit the batch size of commit operations to a specified number of items.
   void set_max_commit_batch_size(int x) { max_commit_batch_size_ = x; }
 
  private:
   void RequestNudge(int milliseconds);
 
   // Implements the PROCESS_CLIENT_COMMAND syncer step.
   void ProcessClientCommand(sessions::SyncSession *session);
 
@@ skipping 64 matching lines @@
   }
   return false;
 }
 // Utility function declarations.
 void CopyServerFields(syncable::Entry* src, syncable::MutableEntry* dest);
 void ClearServerData(syncable::MutableEntry* entry);
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCER_H_
+