[Sync] Add auto-generated ModelType in Java.

sync/android/model_type_helper.h

Index: sync/android/model_type_helper.h
diff --git a/sync/android/model_type_helper.h b/sync/android/model_type_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..dc3d6bf97db9c6e415720b54e8fd4f270dc3cf5c
--- /dev/null
+++ b/sync/android/model_type_helper.h
@@ -0,0 +1,16 @@
+// Copyright 2015 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_MODEL_TYPE_HELPER_H_
+#define SYNC_MODEL_TYPE_HELPER_H_
+
+#include <jni.h>
+
+namespace syncer {
+
+bool RegisterModelTypeHelperJni(JNIEnv* env);
+
+}
+
+#endif  // SYNC_MODEL_TYPE_HELPER_H_