[OLD ATTEMPT, DO NOT REVIEW] mustash: Enable connections to mus from the Chrome renderer

content/renderer/BUILD.gn

Index: content/renderer/BUILD.gn
diff --git a/content/renderer/BUILD.gn b/content/renderer/BUILD.gn
index aa203aa23d93ec146d6f3bab0040a1ca89f7a746..6d9fb8ac3d832917c350a2f7bd18b82029e0aea1 100644
--- a/content/renderer/BUILD.gn
+++ b/content/renderer/BUILD.gn
@@ -19,6 +19,7 @@ source_set("renderer") {
   configs += [
     "//content:content_implementation",
     "//build/config/compiler:no_size_t_to_int_warning",
+    "//content/public/common:mojo_shell_client",
   ]
 
   deps = [
@@ -73,6 +74,13 @@ source_set("renderer") {
     "//v8",
   ]
 
+  if (use_aura) {
+    sources += [
+      "render_widget_mus.cc",
+      "render_widget_mus.h",
+    ]
+  }
+
   if (is_mac) {
     sources -= [
       "webscrollbarbehavior_impl_gtkoraura.cc",