In medium bowl, mix oil, Sriracha sauce, soy sauce and gingerroot. Add chicken pieces; toss to coat. On each skewer, thread 4 pieces of chicken; cover and refrigerate until ready to grill.
In 2-quart saucepan, heat rice, 1 3/4 cups water, the garlic and salt to boiling over high heat. Stir; cover and reduce heat to low. Cook 20 minutes. Remove from heat; cover and let stand 5 minutes. Fluff with fork; stir in cilantro. Cover to keep warm.
Meanwhile, spray grill with grilling spray. Heat gas or charcoal grill. Place chicken skewers on grill over medium heat. Cover grill; cook 8 to 10 minutes, turning occasionally to cook on all sides, until chicken is no longer pink in center.