[Athena] Hide the windows which used to be in split view in ActivateSplitMode()

athena/wm/split_view_controller.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_SPLIT_VIEW_CONTROLLER_H_
 #define ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_
 
 #include "athena/athena_export.h"
 #include "athena/wm/bezel_controller.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 87 matching lines @@
 
   // Windows for the left and right activities shown in SCROLLING and ACTIVE
   // states. In INACTIVE state these are NULL.
   aura::Window* left_window_;
   aura::Window* right_window_;
 
   // Position of the separator between left_window_ and right_window_ in
   // container_ coordinates (along the x axis).
   int separator_position_;
 
+  // Windows which should be hidden when the animation initiated by
+  // UpdateLayout() completes.
+  std::vector<aura::Window*> to_hide_;
+
   base::WeakPtrFactory<SplitViewController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SplitViewController);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_