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diff --git a/sync/engine/non_blocking_type_processor_core_interface.h b/sync/engine/non_blocking_type_processor_core_interface.h
new file mode 100644
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+++ b/sync/engine/non_blocking_type_processor_core_interface.h
@@ -0,0 +1,24 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SYNC_ENGINE_NON_BLOCKING_TYPE_CORE_INTERFACE_H_
+#define SYNC_ENGINE_NON_BLOCKING_TYPE_CORE_INTERFACE_H_
+
+#include "sync/engine/non_blocking_sync_common.h"
+
+namespace syncer {
+
+// An interface representing a NonBlockingTypeProcessorCore and its thread.
+// This abstraction is useful in tests.
+class SYNC_EXPORT_PRIVATE NonBlockingTypeProcessorCoreInterface {
+ public:
+  NonBlockingTypeProcessorCoreInterface();
+  virtual ~NonBlockingTypeProcessorCoreInterface();
+
+  virtual void RequestCommits(const CommitRequestDataList& list) = 0;
+};
+
+}  // namespace syncer
+
+#endif  // SYNC_ENGINE_NON_BLOCKING_TYPE_CORE_INTERFACE_H_