[Sync] Ensure cryptographer ready before encrypting.

chrome/browser/sync/engine/syncapi.h

 // Copyright (c) 2011 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.
 
 // This file defines the "sync API", an interface to the syncer
 // backend that exposes (1) the core functionality of maintaining a consistent
 // local snapshot of a hierarchical object set; (2) a means to transactionally
 // access and modify those objects; (3) a means to control client/server
 // synchronization tasks, namely: pushing local object modifications to a
 // server, pulling nonlocal object modifications from a server to this client,
@@ skipping 1015 matching lines @@
   // Call periodically from a database-safe thread to persist recent changes
   // to the syncapi model.
   void SaveChanges();
 
   // Issue a final SaveChanges, close sqlite handles, and stop running threads.
   // Must be called from the same thread that called Init().
   void Shutdown();
 
   UserShare* GetUserShare() const;
 
+  // Inform the cryptographer of the most recent passphrase and set of encrypted
+  // types, then ensures all data that needs encryption is encrypted with the
+  // appropriate passphrase.
+  // Note: opens a transaction and can trigger ON_PASSPHRASE_REQUIRED, so must
+  // only be called after syncapi has been initialized.
+  void ReloadNigori();
+
   syncable::ModelTypeSet GetEncryptedDataTypes() const;
 
   // Uses a read-only transaction to determine if the directory being synced has
   // any remaining unsynced items.
   bool HasUnsyncedItems() const;
 
   // Logs the list of unsynced meta handles.
   void LogUnsyncedItems(int level) const;
 
   // Functions used for testing.
 
   void TriggerOnNotificationStateChangeForTest(
       bool notifications_enabled);
 
   void TriggerOnIncomingNotificationForTest(
       const syncable::ModelTypeBitSet& model_types);
 
  private:
   // An opaque pointer to the nested private class.
   SyncInternal* data_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncManager);
 };
 
 }  // namespace sync_api
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCAPI_H_