Christopher Cross — the San Antonio native singer-songwriter with five Grammys, an Oscar and a Golden Globe — is coming to Sunken Garden Theater to raise money for the place he first played 55 years ago. The Alamo Heights graduate known for ’70s and ’80s chart-toppers such as “Sailing” and “Ride Like the Wind” will performing Dec. 4 in his former hometown to raise money for Brackenridge Park.