Fall back to the default visual if no X8R8G8B8. Bug 18510357 Change-Id: I2406106482b8c65408df783ebb78f5abd17a6320 Reviewed-on: https://swiftshader-review.googlesource.com/1593 Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Nicolas Capens <nicolascapens@google.com>