Makes ash/wm/common a library

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/ash_export.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 {
@@ skipping 123 matching lines @@
 
   base::ObserverList<WmWindowObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WmWindowAura);
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_AURA_WM_WINDOW_AURA_H_