[Sync] Add ability to save/restore Nigori to SyncEncryptionHandlerImpl

sync/internal_api/js_sync_encryption_handler_observer.cc

 // 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.
 
 #include "sync/internal_api/js_sync_encryption_handler_observer.h"
 
 #include <cstddef>
 
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 95 matching lines @@
   base::DictionaryValue details;
   details.SetString("passphraseType",
                     PassphraseTypeToString(type));
   details.SetInteger("explicitPassphraseTime",
                      TimeToProtoTime(explicit_passphrase_time));
   HandleJsEvent(FROM_HERE,
                 "onPassphraseTypeChanged",
                 JsEventDetails(&details));
 }
 
+void JsSyncEncryptionHandlerObserver::OnLocalSetCustomPassphrase(
+    const SyncEncryptionHandler::NigoriState& nigori_state) {
+}
+
 void JsSyncEncryptionHandlerObserver::HandleJsEvent(
     const tracked_objects::Location& from_here,
     const std::string& name, const JsEventDetails& details) {
   if (!event_handler_.IsInitialized()) {
     NOTREACHED();
     return;
   }
   event_handler_.Call(from_here,
                       &JsEventHandler::HandleJsEvent, name, details);
 }
 
 }  // namespace syncer