athena: Fix switching windows with title-drag in split-view.

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 21 matching lines @@
   // Activates split-view mode with |left| and |right| windows. If |left| and/or
   // |right| is NULL, then the first window in the window-list (which is neither
   // |left| nor |right|) is selected instead.
   void ActivateSplitMode(aura::Window* left, aura::Window* right);
 
   // Resets the internal state to an inactive state. Calling this does not
   // change the window bounds/transforms etc. The caller must take care of
   // making any necessary changes.
   void DeactivateSplitMode();
 
+  void ReplaceWindow(aura::Window* window,
+                     aura::Window* replace_with);
+
   aura::Window* left_window() { return left_window_; }
   aura::Window* right_window() { return right_window_; }
 
  private:
   enum State {
     // Split View mode is not active. |left_window_| and |right_window| are
     // NULL.
     INACTIVE,
     // Two windows |left_window_| and |right_window| are shown side by side and
     // there is a horizontal scroll in progress which is dragging the separator
@@ skipping 37 matching lines @@
   int separator_position_;
 
   base::WeakPtrFactory<SplitViewController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SplitViewController);
 };
 
 }  // namespace athena
 
 #endif  // ATHENA_WM_SPLIT_VIEW_CONTROLLER_H_