ozone gbm: whitelist 3 DRM ioctl code for native GpuMemoryBuffer.

sandbox/linux/BUILD.gn

Index: sandbox/linux/BUILD.gn
diff --git a/sandbox/linux/BUILD.gn b/sandbox/linux/BUILD.gn
index d632bd4fafbb67d1a2dc1501671f8f0893a63468..a2bb102cd36108ed24229aa15d47d7f8676de497 100644
--- a/sandbox/linux/BUILD.gn
+++ b/sandbox/linux/BUILD.gn
@@ -12,6 +12,8 @@ declare_args() {
 
   # On Android, use plain GTest.
   use_base_test_suite = is_linux
+
+  use_vgem_map = false
 }
 
 # We have two principal targets: sandbox and sandbox_linux_unittests
@@ -237,6 +239,10 @@ component("seccomp_bpf_helpers") {
     ":sandbox_services",
     ":seccomp_bpf",
   ]
+
+  if (use_vgem_map) {
+    defines += [ "USE_VGEM_MAP" ]
+  }
 }
 
 if (is_linux) {