Simplify to a single implementation across all platforms. Document the class and members. Also add: • Constructor with event type and initial state • clear() method. • wait() method with timeout. • operator bool(). Bug: b/133127573 Change-Id: I612dc8a1011aaa2cfa50f40c59849323348b3054 Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/31679 Kokoro-Presubmit: kokoro <noreply+kokoro@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Ben Clayton <bclayton@google.com>
