WIP: Propagate SurfaceID up window tree hierarchy

ash/mus/bridge/wm_shell_mus.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/mus/bridge/wm_shell_mus.h"
 
 #include <utility>
 
 #include "ash/common/accelerators/accelerator_controller.h"
 #include "ash/common/session/session_state_delegate.h"
@@ skipping 186 matching lines @@
        root_window_controllers_) {
     if (root_window_controller->GetDisplay().id() == id)
       return root_window_controller;
   }
   NOTREACHED();
   return nullptr;
 }
 
 WmWindow* WmShellMus::NewWindow(ui::wm::WindowType window_type,
                                 ui::LayerType layer_type) {
-  WmWindowMus* window = WmWindowMus::Get(window_tree_client()->NewWindow());
+  ui::Window* uiwindow = nullptr;
+  if (layer_type == ui::LAYER_NOT_DRAWN)
+    uiwindow = window_tree_client()->NewWindowContainer();
+  else
+    uiwindow = window_tree_client()->NewWindow();
+  WmWindowMus* window = WmWindowMus::Get(uiwindow);
   window->set_wm_window_type(window_type);
   // TODO(sky): support layer_type.
   NOTIMPLEMENTED();
   return window;
 }
 
 WmWindow* WmShellMus::GetFocusedWindow() {
   return WmWindowMus::Get(window_tree_client()->GetFocusedWindow());
 }
 
@@ skipping 228 matching lines @@
                     OnWindowActivated(gained_active, lost_active));
 }
 
 void WmShellMus::OnDidDestroyClient(ui::WindowTreeClient* client) {
   DCHECK_EQ(window_tree_client(), client);
   client->RemoveObserver(this);
 }
 
 }  // namespace mus
 }  // namespace ash