$NetBSD$

--- gpu/command_buffer/service/BUILD.gn.orig	2020-07-15 18:56:47.000000000 +0000
+++ gpu/command_buffer/service/BUILD.gn
@@ -331,7 +331,7 @@ target(link_target_type, "gles2_sources"
       "//gpu/vulkan",
     ]
 
-    if (is_linux || is_fuchsia || is_android || is_win) {
+    if (is_linux || is_fuchsia || is_android || is_win || is_bsd) {
       sources += [
         "external_vk_image_backing.cc",
         "external_vk_image_backing.h",
@@ -355,7 +355,7 @@ target(link_target_type, "gles2_sources"
       ]
     }
 
-    if (is_linux && use_dawn) {
+    if ((is_linux || is_bsd) && use_dawn) {
       sources += [
         "external_vk_image_dawn_representation.cc",
         "external_vk_image_dawn_representation.h",