Move Mus into chrome's process when running with --mus.

services/ui/ws/window_server.h

Index: services/ui/ws/window_server.h
diff --git a/services/ui/ws/window_server.h b/services/ui/ws/window_server.h
index df851a4d5bd5d792d3759e8fbcfe339c5e5ebaf5..6c16c5a94be1a2ad85f6197d4762e13b10c0bbed 100644
--- a/services/ui/ws/window_server.h
+++ b/services/ui/ws/window_server.h
@@ -53,11 +53,16 @@ class WindowServer : public ServerWindowDelegate,
                      public UserIdTrackerObserver,
                      public cc::mojom::FrameSinkManagerClient {
  public:
-  explicit WindowServer(WindowServerDelegate* delegate);
+  WindowServer(WindowServerDelegate* delegate,
+               scoped_refptr<base::SingleThreadTaskRunner>& resource_runner);
   ~WindowServer() override;
 
   WindowServerDelegate* delegate() { return delegate_; }
 
+  scoped_refptr<base::SingleThreadTaskRunner>& resource_runner() {
+    return resource_runner_;
+  }
+
   UserIdTracker* user_id_tracker() { return &user_id_tracker_; }
   const UserIdTracker* user_id_tracker() const { return &user_id_tracker_; }
 
@@ -370,6 +375,8 @@ class WindowServer : public ServerWindowDelegate,
 
   WindowServerDelegate* delegate_;
 
+  scoped_refptr<base::SingleThreadTaskRunner> resource_runner_;
+
   // ID to use for next WindowTree.
   ClientSpecificId next_client_id_;