FYI, I've started looking at this in b/112486795 as well. 2.4.93 introduces a regression that causes eglInitialize to fail on grunt. I'm currently investigating that.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/libdrm/+/479c8c408b65e989f977f4754868e03490b712dc

commit 479c8c408b65e989f977f4754868e03490b712dc
Author: Nicolas Boichat <drinkcat@google.com>
Date: Tue Aug 14 21:31:15 2018

libdrm: Add PRESUBMIT.cfg

Prevent it from complaining about license information and tabs.

Old-BUG=b:26575005
Old-TEST=Submit patches, presubmit script does not complain.

Signed-off-by: Nicolas Boichat <drinkcat@google.com>
Reviewed-on: https://chromium-review.googlesource.com/324166
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
(rebased from chromeos-2.4.89)

Old-BUG=b:70826146
Signed-off-by: Kristian H. Kristensen <hoegsberg@chromium.org>

Old-BUG=b:80474314
Signed-off-by: Benjamin Gordon <bmgordon@chromium.org>

BUG= 874233 
Signed-off-by: Zach Reizner <zachr@google.com>

Change-Id: I6e528fd8c4e8ea02f36a3ec45d2b19701ca8a0fa

[add] https://crrev.com/479c8c408b65e989f977f4754868e03490b712dc/PRESUBMIT.cfg

This seems obsolute given libdrm is currently at 2.4.94.