sync: Add interfaces for per-type sync

sync/test/engine/mock_update_handler.h

Index: sync/test/engine/mock_update_handler.h
diff --git a/sync/test/engine/mock_update_handler.h b/sync/test/engine/mock_update_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..7ee0c37aebe25181d9400f8e7bad6a8553f34287
--- /dev/null
+++ b/sync/test/engine/mock_update_handler.h
@@ -0,0 +1,36 @@
+// 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_TEST_ENGINE_MOCK_UPDATE_HANDLER_H_
+#define SYNC_TEST_ENGINE_MOCK_UPDATE_HANDLER_H_
+
+#include "base/compiler_specific.h"
+#include "sync/engine/update_handler.h"
+#include "sync/internal_api/public/base/model_type.h"
+#include "sync/protocol/sync.pb.h"
+
+namespace syncer {
+
+class MockUpdateHandler : public UpdateHandler {
+ public:
+  explicit MockUpdateHandler(ModelType type);
+  virtual ~MockUpdateHandler();
+
+  // UpdateHandler implementation.
+  virtual void GetDownloadProgress(
+      sync_pb::DataTypeProgressMarker* progress_marker) const OVERRIDE;
+  virtual void ProcessGetUpdatesResponse(
+      const sync_pb::DataTypeProgressMarker& progress_marker,
+      const SyncEntityList& applicable_updates,
+      sessions::StatusController* status) OVERRIDE;
+  virtual void ApplyUpdates(sessions::StatusController* status) OVERRIDE;
+  virtual void PassiveApplyUpdates(sessions::StatusController* status) OVERRIDE;
+
+ private:
+  sync_pb::DataTypeProgressMarker progress_marker_;
+};
+
+}  // namespace syncer
+
+#endif  // SYNC_TEST_ENGINE_MOCK_UPDATE_HANDLER_H_