KANSAS CITY, Mo. — Patrick Mahomes threw for 260 yards and a touchdown while running for a score on his ailing ankle, and the Kansas City Chiefs took a big step toward securing the No. 1 seed in the AFC playoffs with a 27-19 victory over the Houston Texans on Saturday.The AFC West champion Chiefs (14-1), who have won four straight against the AFC South champ Texans (9-6), can clinch the postseason bye if Buffalo loses to or ties New England on Sunday. If the Bills win, Kansas City can wrap it up by beating Pittsburgh on Christmas Day.Xavier Worthy had seven catches for 65 yards and a touchdown, Kareem Hunt ran for 55 yards and another score, and Marquise Brown had five catches for 45 yards for Kansas City in his first game this season after recovering from a shoulder injury.C.J. Stroud had 244 yards and two touchdown passes with two interceptions for Houston, though one of those TD throws came at great expense. Tank Dell, who had six catches for 98 yards, hurt his left knee on the play and was carted from the field.Dalton Schultz also had a TD reception for the Texans. Joe Mixon was held to 57 yards rushing.There were questions early in the week about whether Mahomes would play after sustaining a high ankle sprain late in last week’s win over Cleveland. But the two-time MVP was off th …