sync: Introduce control data types

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 2439c1ba2c305744d42c1bf3a58bbab89e77e8a6..147431f8e85854b6cd65a1680694fd1162b70874 100644
--- a/sync/test/engine/syncer_command_test.cc
+++ b/sync/test/engine/syncer_command_test.cc
@@ -18,9 +18,11 @@ SyncerCommandTestBase::~SyncerCommandTestBase() {
 
 void SyncerCommandTestBase::SetUp() {
   ResetContext();
-  // The session always expects there to be a passive worker.
+  // The session always expects there to be passive and control workers.
   workers()->push_back(
       make_scoped_refptr(new FakeModelWorker(GROUP_PASSIVE)));
+  workers()->push_back(
+      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();
 }