diff -up chromium-85.0.4183.83/ui/gfx/linux/drm_util_linux.cc.el7-old-libdrm chromium-85.0.4183.83/ui/gfx/linux/drm_util_linux.cc

--- chromium-85.0.4183.83/ui/gfx/linux/drm_util_linux.cc.el7-old-libdrm	2020-08-31 09:38:46.043993882 -0400

+++ chromium-85.0.4183.83/ui/gfx/linux/drm_util_linux.cc	2020-08-31 09:39:21.599906318 -0400

@@ -6,6 +6,11 @@

 #include <drm_fourcc.h>

+// the libdrm in EL-7 is too old to have this define

+#ifndef DRM_FORMAT_P010

+#define DRM_FORMAT_P010 DRM_FORMAT_INVALID

+#endif

+

 #include "base/notreached.h"

 namespace ui {