Wires up immersive mode for chrome and mash

ash/mus/BUILD.gn

Index: ash/mus/BUILD.gn
diff --git a/ash/mus/BUILD.gn b/ash/mus/BUILD.gn
index 06761934555296633ffdc89075f58b0b009305de..3ab6dac5edae08d2490244c145795d60c885c779 100644
--- a/ash/mus/BUILD.gn
+++ b/ash/mus/BUILD.gn
@@ -20,6 +20,8 @@ source_set("lib") {
     "accelerators/accelerator_registrar_impl.h",
     "accessibility_delegate_mus.cc",
     "accessibility_delegate_mus.h",
+    "bridge/immersive_handler_factory_mus.cc",
+    "bridge/immersive_handler_factory_mus.h",
     "bridge/mus_layout_manager_adapter.cc",
     "bridge/mus_layout_manager_adapter.h",
     "bridge/wm_lookup_mus.cc",
@@ -38,6 +40,11 @@ source_set("lib") {
     "disconnected_app_handler.h",
     "drag_window_resizer.cc",
     "drag_window_resizer.h",
+    "frame/custom_frame_view_mus.cc",
+    "frame/custom_frame_view_mus.h",
+    "frame/detached_title_area_renderer.cc",
+    "frame/detached_title_area_renderer.h",
+    "frame/detached_title_area_renderer_host.h",
     "layout_manager.cc",
     "layout_manager.h",
     "move_event_handler.cc",