gl: Test YV12 buffer drm import.

ui/gl/BUILD.gn

Index: ui/gl/BUILD.gn
diff --git a/ui/gl/BUILD.gn b/ui/gl/BUILD.gn
index 159a5b75463ea017eb2616d5acf222b56f87e667..0ebc68167d9f54aaafb01b0bb9f74ffef7a22b9e 100644
--- a/ui/gl/BUILD.gn
+++ b/ui/gl/BUILD.gn
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
@@ -13,6 +14,12 @@ if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
+if (is_chromeos) {
+  pkg_config("libdrm") {
+    packages = [ "libdrm" ]
+  }
+}
+
 config("gl_config") {
   defines = []
   if (use_glx) {
@@ -350,6 +357,9 @@ test("gl_unittests") {
 
   if (use_ozone) {
     sources += [ "gl_image_ozone_native_pixmap_unittest.cc" ]
+    if (is_chromeos && target_cpu != "arm") {
+      sources += [ "gl_image_ozone_native_pixmap_drm_unittest.cc" ]
+    }
   }
 
   if (is_mac) {
@@ -376,6 +386,10 @@ test("gl_unittests") {
     "//ui/gl/init",
   ]
 
+  if (is_chromeos) {
+    configs += [ ":libdrm" ]
+  }
+
   data_deps = [
     "//third_party/mesa:osmesa",
   ]