Try to resuscitate the builds needed to do official GN builds.

ui/display/BUILD.gn

 # Copyright 2014 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")
 
 component("display") {
   sources = [
     "chromeos/display_configurator.cc",
     "chromeos/display_configurator.h",
@@ skipping 37 matching lines @@
       sources -= [ "chromeos/ozone/display_configurator_ozone.cc" ]
     }
   }
 
   if (is_chromeos) {
     deps += [ "//ui/display/types" ]
   }
 
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
-    sources -= [
-      "chromeos/x11/display_configurator_x11.cc",
-      "chromeos/x11/display_mode_x11.cc",
-      "chromeos/x11/display_mode_x11.h",
-      "chromeos/x11/display_snapshot_x11.cc",
-      "chromeos/x11/display_snapshot_x11.h",
-      "chromeos/x11/display_util_x11.cc",
-      "chromeos/x11/display_util_x11.h",
-      "chromeos/x11/native_display_delegate_x11.cc",
-      "chromeos/x11/native_display_delegate_x11.h",
-      "chromeos/x11/native_display_event_dispatcher_x11.cc",
-      "chromeos/x11/native_display_event_dispatcher_x11.h",
-    ]
+    if (is_chromeos) {

[Chris Masone, 2014/11/04 23:33:16]

Ozone is pretty much a replacement for X11, so it really doesn't make sense to
have these when ozone's set to be used. What other platform is setting
use_ozone=true that wants these x11-specific files to still be here?

[brettw, 2014/11/04 23:47:52]

These are filtered out in the non-chromeos case by virtue of being in a chromeos
directory. Double-filtering is an error in GN, so this condition is required for
them to be filtered out in the chroemos case.

This is being triggered by GN itself, which is compiled with use_ozone = true to
avoid X dependencies. Ozone generally works on desktop Linux as well as
chromeos.

[Chris Masone, 2014/11/05 00:53:31]

Acknowledged.

+      sources -= [
+        "chromeos/x11/display_configurator_x11.cc",
+        "chromeos/x11/display_mode_x11.cc",
+        "chromeos/x11/display_mode_x11.h",
+        "chromeos/x11/display_snapshot_x11.cc",
+        "chromeos/x11/display_snapshot_x11.h",
+        "chromeos/x11/display_util_x11.cc",
+        "chromeos/x11/display_util_x11.h",
+        "chromeos/x11/native_display_delegate_x11.cc",
+        "chromeos/x11/native_display_delegate_x11.h",
+        "chromeos/x11/native_display_event_dispatcher_x11.cc",
+        "chromeos/x11/native_display_event_dispatcher_x11.h",
+      ]
+    }
   }
 }
 
 component("test_util") {
   output_name = "display_test_util"
   sources = [
     "chromeos/test/test_display_snapshot.cc",
     "chromeos/test/test_display_snapshot.h",
   ]
 
@@ skipping 31 matching lines @@
     "//ui/gfx/geometry",
   ]
 
   if (is_chromeos) {
     deps += [
       ":display",
       "//ui/display/types",
     ]
   }
 }