Check for both use_ozone and is_chromeos for test.

services/ui/display/BUILD.gn

 # Copyright 2016 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 source_set("display") {
   sources = [
     "platform_screen.cc",
@@ skipping 22 matching lines @@
       "//ui/ozone",
     ]
   } else {
     sources += [
       "platform_screen_stub.cc",
       "platform_screen_stub.h",
     ]
   }
 }
 
-if (use_ozone) {
+if (use_ozone && is_chromeos) {

[Tom (Use chromium acct), 2016/11/03 18:17:28]

Please add a TODO here to make these tests work on Linux ozone.
If possible, also create/Xref a bug and make sure to cc me and
tonikitoo@igalia.com

[kylechar, 2016/11/03 18:23:55]

Screen management is really a Chrome OS only concept. If we're running on
another OS then it's the OS that will do those things and not Chrome.

[rjkroege, 2016/11/04 22:52:44]

But... in a future CrOS=0, ozone=1 world, we will still want mus platform screen
to do something ratinonal yes? in other words, I think that there's still work
for tonikitoo here eventually.

   test("display_service_unittests") {
     sources = [
       "platform_screen_ozone_unittests.cc",
     ]
 
     deps = [
       ":display",
       "//base",
       "//base/test:run_all_unittests",
       "//base/test:test_support",
       "//testing/gmock",
       "//testing/gtest",
       "//ui/display",
       "//ui/gfx",
       "//ui/gfx:test_support",
       "//ui/ozone",
     ]
   }
 }