[Ozone-Dri] Gracefully handle DRM devices with no resources

ui/ozone/platform/dri/drm_device_generator.cc

Index: ui/ozone/platform/dri/drm_device_generator.cc
diff --git a/ui/ozone/platform/dri/drm_device_generator.cc b/ui/ozone/platform/dri/drm_device_generator.cc
index 7b4a568eeda6774551859fc98e047dca331ab98f..13985db458abc5c3161eb3a0471b3d7604fe2731 100644
--- a/ui/ozone/platform/dri/drm_device_generator.cc
+++ b/ui/ozone/platform/dri/drm_device_generator.cc
@@ -18,8 +18,10 @@ scoped_refptr<DriWrapper> DrmDeviceGenerator::CreateDevice(
     const base::FilePath& device_path,
     base::File file) {
   scoped_refptr<DriWrapper> drm = new DriWrapper(device_path, file.Pass());
-  drm->Initialize();
-  return drm;
+  if (drm->Initialize())
+    return drm;
+
+  return nullptr;
 }
 
 }  // namespace ui