Added an ActivationReason parameter to ActivationChangeObserver::OnWindowActivated(...).

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 47 matching lines @@
   // MRU window list. Used by WindowCycleList to avoid adding all cycled
   // windows to the front of the MRU window list.
   void SetIgnoreActivations(bool ignore);
 
  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:
-  void OnWindowActivated(aura::Window* gained_active,
-                         aura::Window* lost_active) override;
+  void OnWindowActivated(
+      aura::client::ActivationChangeObserver::ActivationReason reason,
+      aura::Window* gained_active,
+      aura::Window* lost_active) override;
 
   // Overridden from WindowObserver:
   void OnWindowDestroyed(aura::Window* window) override;
 
   // Uses the focus rules to check whether the window can be activateable,
   // regardless of the state of the System modal dialog.
   bool IsWindowConsideredActivateable(aura::Window* window) const;
 
   // 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_;  // Not owned.
 
   wm::AshFocusRules* focus_rules_;  // Not owned.
 
   bool ignore_window_activations_;
 
   DISALLOW_COPY_AND_ASSIGN(MruWindowTracker);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_MRU_WINDOW_TRACKER_H_