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

ash/wm/mru_window_tracker.cc

 // 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.
 
 #include "ash/wm/mru_window_tracker.h"
 
 #include <algorithm>
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
@@ skipping 156 matching lines @@
     active_window->AddObserver(this);
   else
     mru_windows_.erase(iter);
   // TODO(flackr): Remove this check if this doesn't fire for a while. This
   // should verify that all tracked windows start with a layer, see
   // http://crbug.com/291354.
   CHECK(active_window->layer());
   mru_windows_.push_front(active_window);
 }
 
-void MruWindowTracker::OnWindowActivated(aura::Window* gained_active,
-                                         aura::Window* lost_active) {
+void MruWindowTracker::OnWindowActivated(
+    aura::client::ActivationChangeObserver::ActivationReason reason,
+    aura::Window* gained_active,
+    aura::Window* lost_active) {
   if (!ignore_window_activations_)
     SetActiveWindow(gained_active);
 }
 
 void MruWindowTracker::OnWindowDestroyed(aura::Window* window) {
   // It's possible for OnWindowActivated() to be called after
   // OnWindowDestroying(). This means we need to override OnWindowDestroyed()
   // else we may end up with a deleted window in |mru_windows_|.
   mru_windows_.remove(window);
   window->RemoveObserver(this);
 }
 
 bool MruWindowTracker::IsWindowConsideredActivateable(
     aura::Window* window) const {
   return focus_rules_->IsWindowConsideredActivatable(window);
 }
 
 }  // namespace ash