Makes WorkspaceWindowResizer use ash/wm/common types

ash/wm/aura/wm_window_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_WINDOW_AURA_H_
 #define ASH_WM_AURA_WM_WINDOW_AURA_H_
 
 #include "ash/wm/common/wm_window.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "ui/aura/window_observer.h"
 
 namespace ash {
 namespace wm {
 
 // WmWindowAura is tied to the life of the underlying aura::Window.
 class ASH_EXPORT WmWindowAura : public WmWindow, public aura::WindowObserver {
  public:
   explicit WmWindowAura(aura::Window* window);
   // NOTE: this class is owned by the corresponding window. You shouldn't delete
   // TODO(sky): friend deleter and make private.
   ~WmWindowAura() override;
 
   // Returns a WmWindow for an aura::Window, creating if necessary. |window| may
   // be null, in which case null is returned.
   static WmWindow* Get(aura::Window* window);
 
+  static std::vector<WmWindow*> FromAuraWindows(
+      const std::vector<aura::Window*>& aura_windows);
+
   static aura::Window* GetAuraWindow(WmWindow* wm_window) {
     return const_cast<aura::Window*>(
         GetAuraWindow(const_cast<const WmWindow*>(wm_window)));
   }
   static const aura::Window* GetAuraWindow(const WmWindow* wm_window);
 
   aura::Window* aura_window() { return window_; }
   const aura::Window* aura_window() const { return window_; }
 
   // WmWindow:
@@ skipping 97 matching lines @@
 
   base::ObserverList<WmWindowObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WmWindowAura);
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_AURA_WM_WINDOW_AURA_H_