Update from https://crrev.com/320931

build/linux/system.gyp

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
       ['sysroot!=""', {
         'pkg-config': '<(chroot_cmd) ./pkg-config-wrapper "<(sysroot)" "<(target_arch)" "<(system_libdir)"',
       }, {
@@ skipping 73 matching lines @@
       'udev_set_log_priority',
       'udev_unref',
     ],
   },
   'conditions': [
     [ 'chromeos==0 and use_ozone==0', {
       # Hide GTK and related dependencies for Chrome OS and Ozone, so they won't get
       # added back to Chrome OS and Ozone. Don't try to use GTK on Chrome OS and Ozone.
       'targets': [
         {
+          'target_name': 'atk',
+          'type': 'none',
+          'conditions': [
+            ['_toolset=="target"', {
+              'direct_dependent_settings': {
+                'cflags': [
+                  '<!@(<(pkg-config) --cflags atk)',
+                ],
+                'defines': [
+                  'ATK_LIB_DIR="<!@(<(pkg-config) --variable=libdir atk)"',
+                ],
+              },
+              'link_settings': {
+                'ldflags': [
+                  '<!@(<(pkg-config) --libs-only-L --libs-only-other atk)',
+                ],
+                'libraries': [
+                  '<!@(<(pkg-config) --libs-only-l atk)',
+                ],
+              },
+            }],
+          ],
+        },
+        {
           'target_name': 'gdk',
           'type': 'none',
           'conditions': [
             ['_toolset=="target"', {
               'direct_dependent_settings': {
                 'cflags': [
                   '<!@(<(pkg-config) --cflags gdk-2.0)',
                 ],
               },
               'link_settings': {
@@ skipping 397 matching lines @@
             'ldflags': [
               '<!@(<(pkg-config) --libs-only-L --libs-only-other gbm)',
             ],
             'libraries': [
               '<!@(<(pkg-config) --libs-only-l gbm)',
             ],
           },
         },
       ],
     }],
-    ['ozone_platform_dri==1 or ozone_platform_gbm==1', {
+    ['ozone_platform_dri==1 or ozone_platform_drm==1 or ozone_platform_gbm==1', {
       'targets': [
         {
           'target_name': 'libdrm',
           'type': 'none',
           'direct_dependent_settings': {
             'cflags': [
               '<!@(<(pkg-config) --cflags libdrm)',
             ],
           },
           'link_settings': {
@@ skipping 666 matching lines @@
                   '-Wno-header-guard',
                 ],
               },
             }],
           ]
         }],
       ],
     },
   ],
 }