Enable ash window cycle UI by default.

ui/app_list/presenter/app_list_presenter_impl.cc

 // Copyright 2016 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 "ui/app_list/presenter/app_list_presenter_impl.h"
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_switches.h"
 #include "ui/app_list/pagination_model.h"
 #include "ui/app_list/presenter/app_list_presenter_delegate_factory.h"
@@ skipping 62 matching lines @@
 
 void AppListPresenterImpl::Dismiss() {
   if (!is_visible_)
     return;
 
   // If the app list is currently visible, there should be an existing view.
   DCHECK(view_);
 
   is_visible_ = false;
 
-  // Our widget is currently active. When the animation completes we'll hide
-  // the widget, changing activation. If a menu is shown before the animation
-  // completes then the activation change triggers the menu to close. By
-  // deactivating now we ensure there is no activation change when the
-  // animation completes and any menus stay open.
-  view_->GetWidget()->Deactivate();
+  // The dismissal may have occurred in response to the app list losing
+  // activation. Otherwise, our widget is currently active. When the animation
+  // completes we'll hide the widget, changing activation. If a menu is shown
+  // before the animation completes then the activation change triggers the menu
+  // to close. By deactivating now we ensure there is no activation change when
+  // the animation completes and any menus stay open.
+  if (view_->GetWidget()->IsActive())
+    view_->GetWidget()->Deactivate();
 
   presenter_delegate_->OnDismissed();
   ScheduleAnimation();
 }
 
 void AppListPresenterImpl::ToggleAppList(int64_t display_id) {
   if (IsVisible()) {
     Dismiss();
     return;
   }
@@ skipping 163 matching lines @@
   } else if (should_snap_back_) {
     should_snap_back_ = false;
     ui::ScopedLayerAnimationSettings animation(widget_animator);
     animation.SetTransitionDuration(
         base::TimeDelta::FromMilliseconds(kOverscrollPageTransitionDurationMs));
     widget->SetBounds(view_bounds_);
   }
 }
 
 }  // namespace app_list