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

chrome/browser/sync/glue/sync_backend_host_core.cc

Index: chrome/browser/sync/glue/sync_backend_host_core.cc
diff --git a/chrome/browser/sync/glue/sync_backend_host_core.cc b/chrome/browser/sync/glue/sync_backend_host_core.cc
index 7c077cb3dbf78b0bdafd74aaf958384623745d9a..4589f7cbfb2571ffe709fc3456576f02a404bfb0 100644
--- a/chrome/browser/sync/glue/sync_backend_host_core.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_core.cc
@@ -299,6 +299,14 @@ void SyncBackendHostCore::OnPassphraseTypeChanged(
       type, passphrase_time);
 }
 
+void SyncBackendHostCore::OnLocalSetPassphraseEncryption(
+    const syncer::SyncEncryptionHandler::NigoriState& nigori_state) {
+  host_.Call(
+      FROM_HERE,
+      &SyncBackendHostImpl::HandleLocalSetPassphraseEncryptionOnFrontendLoop,
+      nigori_state);
+}
+
 void SyncBackendHostCore::OnCommitCountersUpdated(
     syncer::ModelType type,
     const syncer::CommitCounters& counters) {