[Sync] Adds a new switch for enabling the new local server backend.

components/sync/driver/glue/sync_backend_host_impl.cc

Index: components/sync/driver/glue/sync_backend_host_impl.cc
diff --git a/components/sync/driver/glue/sync_backend_host_impl.cc b/components/sync/driver/glue/sync_backend_host_impl.cc
index 1132f50c6571a61ac4abea5fef3c9d70db4aa936..9d420acbbf6e64399c1f2830af06bfaed740d51a 100644
--- a/components/sync/driver/glue/sync_backend_host_impl.cc
+++ b/components/sync/driver/glue/sync_backend_host_impl.cc
@@ -79,6 +79,8 @@ void SyncBackendHostImpl::Initialize(
     const std::string& sync_user_agent,
     const SyncCredentials& credentials,
     bool delete_sync_data_folder,
+    bool enable_local_sync_backend,
+    const base::FilePath& local_sync_backend_folder,
     std::unique_ptr<SyncManagerFactory> sync_manager_factory,
     const WeakHandle<UnrecoverableErrorHandler>& unrecoverable_error_handler,
     const base::Closure& report_unrecoverable_error_function,
@@ -119,6 +121,7 @@ void SyncBackendHostImpl::Initialize(
                            core_->GetRequestContextCancelationSignal()),
       credentials, invalidator_ ? invalidator_->GetInvalidatorClientId() : "",
       std::move(sync_manager_factory), delete_sync_data_folder,
+      enable_local_sync_backend, local_sync_backend_folder,
       sync_prefs_->GetEncryptionBootstrapToken(),
       sync_prefs_->GetKeystoreEncryptionBootstrapToken(),
       std::unique_ptr<EngineComponentsFactory>(