Wires up WorkspaceLayoutManager in mash

mash/wm/BUILD.gn

Index: mash/wm/BUILD.gn
diff --git a/mash/wm/BUILD.gn b/mash/wm/BUILD.gn
index cd8893343d6a01b88939219bd1783899c7521395..bf6d59819aad6371b854cbd7ba68502434fec58b 100644
--- a/mash/wm/BUILD.gn
+++ b/mash/wm/BUILD.gn
@@ -73,8 +73,6 @@ source_set("lib") {
     "status_layout_manager.h",
     "user_window_controller_impl.cc",
     "user_window_controller_impl.h",
-    "window_layout.cc",
-    "window_layout.h",
     "window_manager.cc",
     "window_manager.h",
     "window_manager_application.cc",
@@ -162,17 +160,25 @@ source_set("unittests") {
     "app_launch_unittest.cc",
     "frame/move_loop_unittest.cc",
     "layout_manager_unittest.cc",
+    "test/wm_test_base.cc",
+    "test/wm_test_base.h",
+    "test/wm_test_helper.cc",
+    "test/wm_test_helper.h",
     "test/wm_test_screen.cc",
     "test/wm_test_screen.h",
     "window_manager_unittest.cc",
+    "workspace/workspace_layout_manager_unittest.cc",
   ]
 
   deps = [
     ":lib",
+    ":resources",
+    "//ash/wm/common:ash_wm_common",
     "//base",
     "//base/test:test_config",
     "//components/mus/common:mus_common",
     "//components/mus/public/cpp",
+    "//components/mus/public/cpp/tests:test_support",
     "//components/mus/public/cpp/tests:unittest_support",
     "//components/mus/public/interfaces",
     "//mash/wm/public/interfaces",