Adds DesktopWindowTreeHostMus

ui/views/mus/test_utils.h

Index: ui/views/mus/test_utils.h
diff --git a/ui/views/mus/test_utils.h b/ui/views/mus/test_utils.h
index 6bcb68d42b16c440a329ea8ab99e49732424422a..c4d21ee8a424e212d2905357ba45895983696c63 100644
--- a/ui/views/mus/test_utils.h
+++ b/ui/views/mus/test_utils.h
@@ -5,6 +5,8 @@
 #ifndef UI_VIEWS_MUS_TEST_UTILS_H_
 #define UI_VIEWS_MUS_TEST_UTILS_H_
 
+#include "base/memory/ptr_util.h"
+#include "ui/views/mus/mus_client.h"
 #include "ui/views/mus/window_manager_connection.h"
 
 namespace views {
@@ -28,6 +30,18 @@ class WindowManagerConnectionTestApi {
   DISALLOW_COPY_AND_ASSIGN(WindowManagerConnectionTestApi);
 };
 
+class MusClientTestApi {
+ public:
+  static std::unique_ptr<MusClient> Create(
+      service_manager::Connector* connector,
+      const service_manager::Identity& identity) {
+    return base::WrapUnique(new MusClient(connector, identity));
+  }
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(MusClientTestApi);
+};
+
 }  // namespace test
 }  // namespace views