athena: Fix overview mode for split-view 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"
@@ skipping 41 matching lines @@
 
   void ToggleSplitview();
 
   void InstallAccelerators();
 
   // WindowManager:
   virtual void AddObserver(WindowManagerObserver* observer) OVERRIDE;
   virtual void RemoveObserver(WindowManagerObserver* observer) OVERRIDE;
 
   // WindowOverviewModeDelegate:
+  virtual bool IsInSplitViewMode(aura::Window** left_window,
+                                 aura::Window** right_window) OVERRIDE;
   virtual void OnSelectWindow(aura::Window* window) OVERRIDE;
   virtual void OnSplitViewMode(aura::Window* left,
                                aura::Window* right) OVERRIDE;
 
   // aura::WindowObserver:
   virtual void OnWindowAdded(aura::Window* new_window) OVERRIDE;
   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
 
   // AcceleratorHandler:
   virtual bool IsCommandEnabled(int command_id) const OVERRIDE;
@@ skipping 15 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_