Revert "Remove aura and make a pure mojo::View version of the aura::Window FocusController."

sky/BUILD.gn

Index: sky/BUILD.gn
diff --git a/sky/BUILD.gn b/sky/BUILD.gn
index 5a686fbbd74fa703890a7dce6a2683e1ad2b0001..ee665ca6e7a7b1cac95eea1433a0a65c25b60426 100644
--- a/sky/BUILD.gn
+++ b/sky/BUILD.gn
@@ -14,10 +14,14 @@ group("sky") {
     "//sky/engine/web:sky_unittests",
     "//sky/engine/wtf:unittests",
     "//sky/services/inspector",
-    "//sky/tools/debugger",
-    "//sky/tools/tester",
     "//sky/viewer",
   ]
+  if (use_aura) {
+    deps += [
+      "//sky/tools/debugger",
+      "//sky/tools/tester",
+    ]
+  }
   if (!is_android) {
     deps += [ "//third_party/mesa:osmesa" ]
   }