sync: Process 'control' data separately

sync/test/engine/syncer_command_test.cc

Index: sync/test/engine/syncer_command_test.cc
diff --git a/sync/test/engine/syncer_command_test.cc b/sync/test/engine/syncer_command_test.cc
index 61313b1247b5aede713ca3b8b89813c615c3b444..3553a6c668c764490caf56b375bba27a657afa22 100644
--- a/sync/test/engine/syncer_command_test.cc
+++ b/sync/test/engine/syncer_command_test.cc
@@ -21,6 +21,8 @@ void SyncerCommandTestBase::SetUp() {
   // The session always expects there to be a passive worker.
   workers()->push_back(
       make_scoped_refptr(new FakeModelWorker(GROUP_PASSIVE)));
+  workers()->push_back( // FIXME comment
+      make_scoped_refptr(new FakeModelWorker(GROUP_CONTROL)));
 }
 
 void SyncerCommandTestBase::TearDown() {
@@ -56,6 +58,8 @@ void MockDirectorySyncerCommandTest::SetUp() {
   // The session always expects there to be a passive worker.
   workers()->push_back(
       make_scoped_refptr(new FakeModelWorker(GROUP_PASSIVE)));
+  workers()->push_back(
+      make_scoped_refptr(new FakeModelWorker(GROUP_CONTROL)));
   ResetContext();
 }