Mus experiment in content shell on Android.

services/ui/public/cpp/BUILD.gn

Index: services/ui/public/cpp/BUILD.gn
diff --git a/services/ui/public/cpp/BUILD.gn b/services/ui/public/cpp/BUILD.gn
index 3c43016b92202e392d3450abac66dbcc0b253bb9..176f2ae7104219edc27c3fba6e4dc5fc02f861b2 100644
--- a/services/ui/public/cpp/BUILD.gn
+++ b/services/ui/public/cpp/BUILD.gn
@@ -72,7 +72,11 @@ source_set("cpp") {
 source_set("internal_or_test") {
   visibility = [
     "./*",
-    "//services/ui/ws:mus_ws_unittests",
+
+    # We have to be visible to * because the test rule on Android generates
+    # sub-targets prefixed with mus_ws_unittests, but mus_ws_unittests* won't
+    # work in GN.
+    "//services/ui/ws/*",
     "//ui/views/mus:views_mus_unittests",
   ]