sync: Process client commands on commit response

sync/engine/commit.cc

Index: sync/engine/commit.cc
diff --git a/sync/engine/commit.cc b/sync/engine/commit.cc
index 731643a3b4d66a7363618c319341fcd73c1f1af3..4be90cf027013cad925981a5c267277eb9c03956 100644
--- a/sync/engine/commit.cc
+++ b/sync/engine/commit.cc
@@ -123,6 +123,10 @@ SyncerError BuildAndPostCommitsImpl(Syncer* syncer,
       return SERVER_RESPONSE_VALIDATION_FAILED;
     }
 
+    if (commit_response.has_client_command()) {
+      session->ProcessClientCommand(commit_response.client_command());
+    }
+
     TRACE_EVENT_BEGIN0("sync", "ProcessCommitResponse");
     ProcessCommitResponseCommand process_response_command(
         *commit_set, commit_message, commit_response);