[Sync] Move keystore key handling to SyncEncryptionHandlerImpl

sync/syncable/nigori_handler.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 SYNC_SYNCABLE_NIGORI_HANDLER_H_
 #define SYNC_SYNCABLE_NIGORI_HANDLER_H_
 
 #include "sync/internal_api/public/base/model_type.h"
 
 namespace sync_pb {
@@ skipping 17 matching lines @@
   // accordingly.
   virtual void ApplyNigoriUpdate(
       const sync_pb::NigoriSpecifics& nigori,
       syncable::BaseTransaction* const trans) = 0;
 
   // Store the current encrypt everything/encrypted types state into |nigori|.
   virtual void UpdateNigoriFromEncryptedTypes(
       sync_pb::NigoriSpecifics* nigori,
       syncable::BaseTransaction* const trans) const = 0;
 
+  // Whether a keystore key needs to be requested from the sync server.
+  virtual bool NeedKeystoreKey(
+      syncable::BaseTransaction* const trans) const = 0;
+
+  // Set the keystore key the server returned for this account.
+  // Returns true on success, false otherwise.
+  virtual bool SetKeystoreKey(
+      const std::string& key,
+      syncable::BaseTransaction* const trans) = 0;
+
   // Returns the set of currently encrypted types.
   virtual ModelTypeSet GetEncryptedTypes(
       syncable::BaseTransaction* const trans) const = 0;
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_NIGORI_HANDLER_H_