Rewire the local sync switches through the pref store.

components/sync/base/pref_names.cc

 // Copyright 2014 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 "components/sync/base/pref_names.h"
 
 namespace syncer {
 
 namespace prefs {
 
@@ skipping 106 matching lines @@
 const char kSyncPassphraseEncryptionTransitionInProgress[] =
     "sync.passphrase_encryption_transition_in_progress";
 
 // Updated Nigori state after user entering passphrase. This Nigori state should
 // be persisted across restarts and passed to backend when it is initialized
 // after directory cleanup. Preference contains base64 encoded serialized
 // sync_pb::NigoriSpecifics.
 const char kSyncNigoriStateForPassphraseTransition[] =
     "sync.nigori_state_for_passphrase_transition";
 
+// Enabled the local sync backend implemented by the LoopbackServer.
+const char kEnableLocalSyncBackend[] = "sync.enable_local_sync_backend";
+
+// Specifies the local sync backend directory. The name is chosen to mimic
+// user-data-dir etc. This flag only matters if the enable-local-sync-backend
+// flag is present.
+const char kLocalSyncBackendDir[] = "sync.local_sync_backend_dir";
+
 }  // namespace prefs
 
 }  // namespace syncer