sync: Refactor per-datatype throttling

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 c5de28ef7e78595148c055e97b816112d36725ce..eb6dbc66386224807470941ebae2625dfdb847fc 100644
--- a/sync/engine/sync_scheduler_unittest.cc
+++ b/sync/engine/sync_scheduler_unittest.cc
@@ -10,6 +10,7 @@
 #include "base/test/test_timeouts.h"
 #include "sync/engine/sync_scheduler.h"
 #include "sync/engine/syncer.h"
+#include "sync/engine/throttled_data_type_tracker.h"
 #include "sync/sessions/test_util.h"
 #include "sync/test/engine/fake_model_worker.h"
 #include "sync/test/engine/mock_connection_manager.h"
@@ -106,9 +107,10 @@ class SyncSchedulerTest : public testing::Test {
 
     connection_.reset(new MockConnectionManager(directory()));
     connection_->SetServerReachable();
+    throttled_data_type_tracker_.reset(new ThrottledDataTypeTracker(NULL));
     context_.reset(new SyncSessionContext(
             connection_.get(), directory(), routing_info, workers,
-            &extensions_activity_monitor_,
+            &extensions_activity_monitor_, throttled_data_type_tracker_.get(),
             std::vector<SyncEngineEventListener*>(), NULL, NULL));
     context_->set_notifications_enabled(true);
     context_->set_account_name("Test");
@@ -213,6 +215,7 @@ class SyncSchedulerTest : public testing::Test {
   MockDelayProvider* delay_;
   std::vector<scoped_refptr<FakeModelWorker> > workers_;
   FakeExtensionsActivityMonitor extensions_activity_monitor_;
+  scoped_ptr<ThrottledDataTypeTracker> throttled_data_type_tracker_;
 };
 
 class BackoffTriggersSyncSchedulerTest : public SyncSchedulerTest {