Rationalize the top-level BUILD.gn rules a bit

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index bb7dfc453d04c33e61c39311ddc2008178a2409a..a3e4bf8f701507d00034da1c49bf69689d1cf606 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -2,12 +2,15 @@
 # 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")
+
 # This target will be built if no target is specified when invoking ninja.
 group("default") {
   testonly = true
 
   deps = [
     "//apps",
+    "//benchmarks",
     "//crypto:crypto_unittests",
     "//examples",
     "//mojo",
@@ -18,7 +21,7 @@ group("default") {
     "//ui/events:events_unittests",
   ]
 
-  if (!is_android && !is_win) {
+  if (!is_android) {
     deps += [ "//tools/xdisplaycheck" ]
   }
 
@@ -26,6 +29,13 @@ group("default") {
     deps += [ "//sandbox/linux:sandbox" ]
     deps += [ "//sandbox/linux:sandbox_linux_unittests" ]
   }
+
+  if (use_ozone) {
+    deps += [
+      "//ui/ozone",
+      "//ui/ozone/demo",
+    ]
+  }
 }
 
 # Deprecated name for the default build target.