Wires up WorkspaceLayoutManager in mash

mash/wm/window_manager.h

Index: mash/wm/window_manager.h
diff --git a/mash/wm/window_manager.h b/mash/wm/window_manager.h
index fdb28d2ca3b69d3e95e83edae2bdbcb19eb49bdd..fa6026076cefe479a15d8f745f8b4f799f3abd67 100644
--- a/mash/wm/window_manager.h
+++ b/mash/wm/window_manager.h
@@ -38,13 +38,14 @@ class WindowManager : public mus::WindowTracker,
     return window_manager_client_;
   }
 
+  // Creates a new top level window.
+  mus::Window* NewTopLevelWindow(
+      std::map<std::string, std::vector<uint8_t>>* properties);
+
  private:
   gfx::Rect CalculateDefaultBounds(mus::Window* window) const;
   gfx::Rect GetMaximizedWindowBounds() const;
 
-  mus::Window* NewTopLevelWindow(
-      std::map<std::string, std::vector<uint8_t>>* properties);
-
   // mus::WindowObserver:
   void OnTreeChanging(const TreeChangeParams& params) override;