[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 533f26fb850d86cdcbe580e37347bde9e503b9ab..4f161366fa5d7cdd445d0a6dfb35c58ce013948a 100644
--- a/chrome/browser/sync/glue/sync_backend_host_core.cc
+++ b/chrome/browser/sync/glue/sync_backend_host_core.cc
@@ -297,6 +297,13 @@ void SyncBackendHostCore::OnPassphraseTypeChanged(
       type, passphrase_time);
 }
 
+void SyncBackendHostCore::OnLocalSetCustomPassphrase(
+    const syncer::SyncEncryptionHandler::NigoriState& nigori_state) {
+  host_.Call(FROM_HERE,
+             &SyncBackendHostImpl::HandleLocalSetCustomPassphraseOnFrontendLoop,
+             nigori_state);
+}
+
 void SyncBackendHostCore::OnCommitCountersUpdated(
     syncer::ModelType type,
     const syncer::CommitCounters& counters) {