Content "gn check" work.

content/utility/BUILD.gn

Index: content/utility/BUILD.gn
diff --git a/content/utility/BUILD.gn b/content/utility/BUILD.gn
index 9aea9db22bd017ab4b1fd27581a8aac8283d261e..0ef4261ba32d4e067fc0e8ceff43a51706df7aef 100644
--- a/content/utility/BUILD.gn
+++ b/content/utility/BUILD.gn
@@ -7,8 +7,11 @@ import("//media/media_options.gni")
 
 source_set("utility") {
   # Only the public target should depend on this. All other targets (even
-  # internal content ones) should depend on the public one.
-  visibility = [ "//content/public/utility:utility_sources" ]
+  # internal content ones other than test) should depend on the public one.
+  visibility = [
+    ":for_content_tests",
+    "//content/public/utility:utility_sources",
+  ]
 
   sources =
       rebase_path(content_utility_gypi_values.utility_sources, ".", "//content")
@@ -17,11 +20,13 @@ source_set("utility") {
 
   deps = [
     "//base",
+    "//components/scheduler",
     "//content:export",
     "//content/public/child:child_sources",
     "//content/public/common:common_sources",
     "//content/public/common:mojo_bindings",
     "//courgette:courgette_lib",
+    "//media/mojo/services:application_factory",
     "//mojo/common",
     "//mojo/public/cpp/bindings",
     "//mojo/shell",
@@ -35,3 +40,13 @@ source_set("utility") {
     deps += [ "//media/mojo/services:application_factory" ]
   }
 }
+
+# See comment at the top of //content/BUILD.gn for how this works.
+group("for_content_tests") {
+  visibility = [ "//content/test/*" ]
+  if (!is_component_build) {
+    public_deps = [
+      ":utility",
+    ]
+  }
+}