Android sandbox: workaround for restricted errno values.

sandbox/linux/seccomp-bpf/errorcode.h

Index: sandbox/linux/seccomp-bpf/errorcode.h
diff --git a/sandbox/linux/seccomp-bpf/errorcode.h b/sandbox/linux/seccomp-bpf/errorcode.h
index 901525c6f9353116e94b34ebdedf66754019a0fa..61ec11013dae426238cc998d65d576cdb61ba68f 100644
--- a/sandbox/linux/seccomp-bpf/errorcode.h
+++ b/sandbox/linux/seccomp-bpf/errorcode.h
@@ -34,6 +34,8 @@ class ErrorCode {
     //       indicate success, but it won't actually run the system call.
     //       This is very different from return ERR_ALLOWED.
     ERR_MIN_ERRNO = 0,
+    // TODO(markus): Android only supports errno up to 255
+    // (crbug.com/181647).
     ERR_MAX_ERRNO = 4095,
   };