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

chrome/browser/sync/glue/sync_backend_host_impl.cc

Index: chrome/browser/sync/glue/sync_backend_host_impl.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host_impl.cc b/chrome/browser/sync/glue/sync_backend_host_impl.cc
index c0b76604eedb0bb6c14378f95500d58cf0ed2237..15f42b14f7e24fc5058c88d94402c3e468fb3684 100644
--- a/chrome/browser/sync/glue/sync_backend_host_impl.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_impl.cc
@@ -811,6 +811,12 @@ void SyncBackendHostImpl::HandlePassphraseTypeChangedOnFrontendLoop(
   cached_explicit_passphrase_time_ = explicit_passphrase_time;
 }
 
+void SyncBackendHostImpl::HandleLocalSetPassphraseEncryptionOnFrontendLoop(
+    const syncer::SyncEncryptionHandler::NigoriState& nigori_state) {
+  DCHECK_EQ(base::MessageLoop::current(), frontend_loop_);
+  frontend_->OnLocalSetPassphraseEncryption(nigori_state);
+}
+
 void SyncBackendHostImpl::HandleConnectionStatusChangeOnFrontendLoop(
     syncer::ConnectionStatus status) {
   if (!frontend_)