chromeos: Makes mushrome use simplified display management

mash/package/mash_packaged_service.cc

Index: mash/package/mash_packaged_service.cc
diff --git a/mash/package/mash_packaged_service.cc b/mash/package/mash_packaged_service.cc
index b5f45e2df39a47579a9de15170152c30251a2f0d..06d8523e4ef49bbaa1a6f615c02224dd73e065c9 100644
--- a/mash/package/mash_packaged_service.cc
+++ b/mash/package/mash_packaged_service.cc
@@ -87,8 +87,11 @@ std::unique_ptr<service_manager::Service> MashPackagedService::CreateService(
   }
 
 #if defined(OS_CHROMEOS)
-  if (name == ash::mojom::kServiceName)
-    return base::WrapUnique(new ash::mus::WindowManagerApplication);
+  if (name == ash::mojom::kServiceName) {
+    const bool show_primary_host_on_connect = true;
+    return base::WrapUnique(
+        new ash::mus::WindowManagerApplication(show_primary_host_on_connect));
+  }
   if (name == "accessibility_autoclick")
     return base::WrapUnique(new ash::autoclick::AutoclickApplication);
   if (name == "touch_hud")