sync: Refactor per-datatype throttling

sync/test/engine/syncer_command_test.h

Index: sync/test/engine/syncer_command_test.h
diff --git a/sync/test/engine/syncer_command_test.h b/sync/test/engine/syncer_command_test.h
index bfa567f21d44039199e72319075caac390c3d2e5..04c707c598aa809000427ea7ad33b1f221dc10d2 100644
--- a/sync/test/engine/syncer_command_test.h
+++ b/sync/test/engine/syncer_command_test.h
@@ -13,6 +13,7 @@
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop.h"
+#include "sync/engine/throttled_data_type_tracker.h"
 #include "sync/engine/model_changing_syncer_command.h"
 #include "sync/engine/model_safe_worker.h"
 #include "sync/engine/traffic_recorder.h"
@@ -126,6 +127,7 @@ class SyncerCommandTestBase : public testing::Test,
     context_.reset(new sessions::SyncSessionContext(
             mock_server_.get(), directory(),
             registrar(), &extensions_activity_monitor_,
+            &throttled_data_type_tracker_,
             std::vector<SyncEngineEventListener*>(),
             &mock_debug_info_getter_,
             &traffic_recorder_));
@@ -201,6 +203,7 @@ class SyncerCommandTestBase : public testing::Test,
   ModelSafeRoutingInfo routing_info_;
   NiceMock<MockDebugInfoGetter> mock_debug_info_getter_;
   FakeExtensionsActivityMonitor extensions_activity_monitor_;
+  ThrottledDataTypeTracker throttled_data_type_tracker_;
   TrafficRecorder traffic_recorder_;
   DISALLOW_COPY_AND_ASSIGN(SyncerCommandTestBase);
 };