Fix crash when dragging a half width window to split view from overivew mode

athena/wm/window_manager_impl.h

 // Copyright 2014 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 ATHENA_WM_WINDOW_MANAGER_IMPL_H_
 #define ATHENA_WM_WINDOW_MANAGER_IMPL_H_
 
 #include "athena/input/public/accelerator_manager.h"
 #include "athena/wm/public/window_manager.h"
 #include "athena/wm/title_drag_controller.h"
 #include "athena/wm/window_overview_mode.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "ui/aura/window_observer.h"
 
 namespace wm {
 class ShadowController;
 class WMState;
 }
 
 namespace athena {
 
+namespace test {
+class WindowManagerImplTestApi;
+}
+
 class BezelController;
 class SplitViewController;
 class WindowListProvider;
 class WindowManagerObserver;
 
 class WindowManagerImpl : public WindowManager,
                           public WindowOverviewModeDelegate,
                           public aura::WindowObserver,
                           public AcceleratorHandler,
                           public TitleDragControllerDelegate {
  public:
   WindowManagerImpl();
   virtual ~WindowManagerImpl();
 
   // WindowManager:
   virtual void ToggleOverview() OVERRIDE;
   virtual bool IsOverviewModeActive() OVERRIDE;
 
  private:
-  friend class WindowManagerImplTestApi;
+  friend class test::WindowManagerImplTestApi;
   friend class AthenaContainerLayoutManager;
 
   enum Command {
     CMD_TOGGLE_OVERVIEW,
     CMD_TOGGLE_SPLIT_VIEW,
   };
 
   // Sets whether overview mode is active.
   void SetInOverview(bool active);
 
@@ skipping 34 matching lines @@
   scoped_ptr<TitleDragController> title_drag_controller_;
   scoped_ptr<wm::ShadowController> shadow_controller_;
   ObserverList<WindowManagerObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerImpl);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_WM_WINDOW_MANAGER_IMPL_H_