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

ui/display/BUILD.gn

Index: ui/display/BUILD.gn
diff --git a/ui/display/BUILD.gn b/ui/display/BUILD.gn
index e13abd9553c62f3413b7ccd546f530ccb8206819..94887717b0254939ee138aa4869c9d55c910cfae 100644
--- a/ui/display/BUILD.gn
+++ b/ui/display/BUILD.gn
@@ -55,19 +55,21 @@ component("display") {
 
   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",
+      ]
+    }
   }
 }