sync: Support nudges from non-blocking sync types

sync/engine/sync_scheduler_unittest.cc

Index: sync/engine/sync_scheduler_unittest.cc
diff --git a/sync/engine/sync_scheduler_unittest.cc b/sync/engine/sync_scheduler_unittest.cc
index c231087f9c98683ed81d5094847ed1aa9ba65b39..3ddef3ebcd3ac68a9b2c82ce6a59379b41290785 100644
--- a/sync/engine/sync_scheduler_unittest.cc
+++ b/sync/engine/sync_scheduler_unittest.cc
@@ -19,6 +19,7 @@
 #include "sync/test/callback_counter.h"
 #include "sync/test/engine/fake_model_worker.h"
 #include "sync/test/engine/mock_connection_manager.h"
+#include "sync/test/engine/mock_nudge_handler.h"
 #include "sync/test/engine/test_directory_setter_upper.h"
 #include "sync/util/extensions_activity.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ -130,7 +131,8 @@ class SyncSchedulerTest : public testing::Test {
                                                 &cancelation_signal_));
     connection_->SetServerReachable();
 
-    model_type_registry_.reset(new ModelTypeRegistry(workers_, directory()));
+    model_type_registry_.reset(
+        new ModelTypeRegistry(workers_, directory(), &mock_nudge_handler_));
 
     context_.reset(new SyncSessionContext(
             connection_.get(), directory(),
@@ -232,6 +234,7 @@ class SyncSchedulerTest : public testing::Test {
   scoped_ptr<ModelTypeRegistry> model_type_registry_;
   scoped_ptr<SyncSessionContext> context_;
   scoped_ptr<SyncSchedulerImpl> scheduler_;
+  MockNudgeHandler mock_nudge_handler_;
   MockSyncer* syncer_;
   MockDelayProvider* delay_;
   std::vector<scoped_refptr<ModelSafeWorker> > workers_;