Use active window if on current workspace for fullscreen mode.

ash/wm/mru_window_tracker.h

 // Copyright 2013 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_MRU_WINDOW_TRACKER_H_
 #define ASH_WM_MRU_WINDOW_TRACKER_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 43 matching lines @@
   // Returns the set of windows which can be cycled through using the tracked
   // list of most recently used windows.
   WindowList BuildMruWindowList();
 
   // Starts or stops ignoring window activations. If no longer ignoring
   // activations the currently active window is moved to the front of the
   // MRU window list. Used by WindowCycleList to avoid adding all cycled
   // windows to the front of the MRU window list.
   void SetIgnoreActivations(bool ignore);
 
+  // Returns the most recently used window in |root_window| or NULL if none
+  // found.
+  const aura::Window* GetMruWindowInRoot(const aura::Window* root_window);
+
  private:
   // Updates the mru_windows_ list to insert/move |active_window| at/to the
   // front.
   void SetActiveWindow(aura::Window* active_window);
 
   // Overridden from aura::client::ActivationChangeObserver:
   virtual void OnWindowActivated(aura::Window* gained_active,
                                  aura::Window* lost_active) OVERRIDE;
 
   // Overridden from WindowObserver:
   virtual void OnWindowDestroyed(aura::Window* window) OVERRIDE;
 
   // List of windows that have been activated in containers that we cycle
   // through, sorted by most recently used.
   std::list<aura::Window*> mru_windows_;
 
   aura::client::ActivationClient* activation_client_;
 
   bool ignore_window_activations_;
 
   DISALLOW_COPY_AND_ASSIGN(MruWindowTracker);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_MRU_WINDOW_TRACKER_H_