Sync: Add a SyncTypePreferenceProvider interface.

chrome/browser/sync/sync_type_preference_provider.h

Index: chrome/browser/sync/sync_type_preference_provider.h
diff --git a/chrome/browser/sync/sync_type_preference_provider.h b/chrome/browser/sync/sync_type_preference_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..1928e463e5549a2a5b9bafef1157e5c9182ca5f5
--- /dev/null
+++ b/chrome/browser/sync/sync_type_preference_provider.h
@@ -0,0 +1,18 @@
+// Copyright (c) 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 CHROME_BROWSER_SYNC_SYNC_TYPE_PREFERENCE_PROVIDER_H_
+#define CHROME_BROWSER_SYNC_SYNC_TYPE_PREFERENCE_PROVIDER_H_
+
+#include "sync/internal_api/public/base/model_type.h"
+
+class SyncTypePreferenceProvider {
+ public:
+  virtual syncer::ModelTypeSet GetPreferredDataTypes() const = 0;
+
+ protected:
+  virtual ~SyncTypePreferenceProvider() {}
+};
+
+#endif  // CHROME_BROWSER_SYNC_SYNC_TYPE_PREFERENCE_PROVIDER_H_