Hook up the FocusController behind a flag.

ash/wm/app_list_controller.cc

 // Copyright (c) 2012 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/app_list_controller.h"
 
 #include "ash/launcher/launcher.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
@@ skipping 72 matching lines @@
 
   return offseted;
 }
 
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // AppListController, public:
 
 AppListController::AppListController()
-    : pagination_model_(new app_list::PaginationModel),
+    : FocusChangeShim(Shell::GetInstance()),
+      pagination_model_(new app_list::PaginationModel),
       is_visible_(false),
       view_(NULL),
       should_snap_back_(false) {
   Shell::GetInstance()->AddShellObserver(this);
   pagination_model_->AddObserver(this);
 }
 
 AppListController::~AppListController() {
   // Ensures app list view goes before the controller since pagination model
   // lives in the controller and app list view would access it on destruction.
@@ skipping 251 matching lines @@
     should_snap_back_ = false;
     ui::ScopedLayerAnimationSettings animation(widget_animator);
     animation.SetTransitionDuration(base::TimeDelta::FromMilliseconds(
         app_list::kOverscrollPageTransitionDurationMs));
     widget->SetBounds(view_bounds_);
   }
 }
 
 }  // namespace internal
 }  // namespace ash