Makes WorkspaceLayoutManager use ash/wm/common types

ash/wm/aura/wm_root_window_controller_aura.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/wm/aura/wm_root_window_controller_aura.h"
 
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_widget.h"
@@ skipping 61 matching lines @@
 }
 
 WmGlobals* WmRootWindowControllerAura::GetGlobals() {
   return WmGlobalsAura::Get();
 }
 
 WorkspaceWindowState WmRootWindowControllerAura::GetWorkspaceWindowState() {
   return root_window_controller_->workspace_controller()->GetWindowState();
 }
 
+AlwaysOnTopController* WmRootWindowControllerAura::GetAlwaysOnTopController() {
+  return root_window_controller_->always_on_top_controller();
+}
+
 WmShelf* WmRootWindowControllerAura::GetShelf() {
   return root_window_controller_->shelf()
              ? root_window_controller_->shelf()->shelf()->wm_shelf()
              : nullptr;
 }
 
 WmWindow* WmRootWindowControllerAura::GetWindow() {
   return WmWindowAura::Get(root_window_controller_->GetRootWindow());
 }
 
@@ skipping 34 matching lines @@
     aura::Window* root_window) {
   if (root_window != root_window_controller_->GetRootWindow())
     return;
 
   FOR_EACH_OBSERVER(WmRootWindowControllerObserver, observers_,
                     OnShelfAlignmentChanged());
 }
 
 }  // namespace wm
 }  // namespace ash