The Warriors have officially signed free agents JaVale McGee, Phil Pressey, Elgin Cook and Cameron Jones, a team spokesman confirmed Wednesday to The Chronicle. NBA teams can carry 20-man rosters until trimming them down to 15 the day before the start of the regular season. Undrafted out of Missouri in 2013, he is still trying to find his NBA footing after averaging 13.7 points and 6.9 assists in 31 games last season for the NBA Development League's Idaho Stampede. An undrafted rookie out of Oregon, Cook averaged 6.3 points and 2.8 rebounds in 15.3 minutes per game for Sacramento's Summer League team. Jones averaged 11.1 points, 3.2 rebounds and 2.7 assists in 25.5 minutes per game last season for teams in Greece and Israel.