Refactors StackingController::GetDefaultParent to ash/wm/common

ash/wm/aura/wm_globals_aura.h

 // 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.
 
 #ifndef ASH_WM_AURA_WM_GLOBALS_AURA_H_
 #define ASH_WM_AURA_WM_GLOBALS_AURA_H_
 
 #include <set>
 
 #include "ash/ash_export.h"
@@ skipping 18 matching lines @@
 
   static WmGlobalsAura* Get();
 
   // WmGlobals:
   WmWindow* GetFocusedWindow() override;
   WmWindow* GetActiveWindow() override;
   WmWindow* GetRootWindowForDisplayId(int64_t display_id) override;
   WmWindow* GetRootWindowForNewWindows() override;
   std::vector<WmWindow*> GetMruWindowListIgnoreModals() override;
   bool IsForceMaximizeOnFirstRun() override;
+  bool IsUserSessionBlocked() override;
   bool IsScreenLocked() override;
   void LockCursor() override;
   void UnlockCursor() override;
   std::vector<WmWindow*> GetAllRootWindows() override;
   void RecordUserMetricsAction(WmUserMetricsAction action) override;
   std::unique_ptr<WindowResizer> CreateDragWindowResizer(
       std::unique_ptr<WindowResizer> next_window_resizer,
       wm::WindowState* window_state) override;
   bool IsOverviewModeSelecting() override;
   bool IsOverviewModeRestoringMinimizedWindows() override;
@@ skipping 25 matching lines @@
 
   base::ObserverList<WmOverviewModeObserver> overview_mode_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WmGlobalsAura);
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_AURA_WM_GLOBALS_AURA_H_