Historically, the Texians were able to keep most native Americans neutral during the texas revolution, via both informal and formal treaties. However, this neutrality was threatened by three major factors: Andrew Jackson's enacting the
Indian Removal Act, the U.S. support/assistance of the Texians during the revolution, and the Mexican Republic's disjointed 2nd class treatment of mestizos and native Americans in the early 1800's. There were some incidents of indian participation, for and against, and there always loomed the very large possibility the indians would side with the Mexican Republic in exchange for land rights/privileges, particularly due to a U.S. policy denying indians the right to own land
(which may or may not have been attached to the Indian Removal Act, can't recall at the moment).
disclaimer: I am not, by any means, an American history buff. If my information is incorrect on certain aspects, by all means correct me.