sync: Move migration signal out of snapshot

sync/engine/all_status.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.
 //
 // The AllStatus object watches various sync engine components and aggregates
 // the status of all of them into one place.
 
 #ifndef SYNC_INTERNAL_API_ALL_STATUS_H_
 #define SYNC_INTERNAL_API_ALL_STATUS_H_
 
@@ skipping 27 matching lines @@
   friend class ScopedStatusLock;
  public:
   AllStatus();
   virtual ~AllStatus();
 
   // SyncEngineEventListener implementation.
   virtual void OnSyncCycleEvent(const SyncCycleEvent& event) OVERRIDE;
   virtual void OnActionableError(const SyncProtocolError& error) OVERRIDE;
   virtual void OnRetryTimeChanged(base::Time retry_time) OVERRIDE;
   virtual void OnThrottledTypesChanged(ModelTypeSet throttled_types) OVERRIDE;
+  virtual void OnMigrationRequested(ModelTypeSet types) OVERRIDE;
 
   SyncStatus status() const;
 
   void SetNotificationsEnabled(bool notifications_enabled);
 
   void IncrementNotifiableCommits();
 
   void IncrementNotificationsReceived();
 
   void SetEncryptedTypes(ModelTypeSet types);
@@ skipping 24 matching lines @@
  public:
   explicit ScopedStatusLock(AllStatus* allstatus);
   ~ScopedStatusLock();
  protected:
   AllStatus* allstatus_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_ALL_STATUS_H_