Stub out ScreenManagerOzoneExternal

services/ui/display/BUILD.gn

Index: services/ui/display/BUILD.gn
diff --git a/services/ui/display/BUILD.gn b/services/ui/display/BUILD.gn
index c0bd6e7338f1dfab053ea4e977733a309063b965..3c60160c1fab173485715ea3890219d55a3c82f7 100644
--- a/services/ui/display/BUILD.gn
+++ b/services/ui/display/BUILD.gn
@@ -36,8 +36,8 @@ source_set("display") {
     ]
   } else {
     sources += [
-      "screen_manager_stub_internal.cc",

[kylechar, 2017/02/13 21:23:38]

We still need screen_manager_stub_internal.cc/h if use_ozone=false. Some tests
run on Linux/Windows and will go through the internal mode code path.

[tonikitoo, 2017/02/13 21:37:38]

Done.

-      "screen_manager_stub_internal.h",
+      "screen_manager_ozone_external.cc",
+      "screen_manager_ozone_external.h",
     ]
   }
 }