Auto hide app list on Windows when it loses focus.

ash/shell/app_list.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 <string>
 
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
 #include "ash/shell/toplevel_window.h"
 #include "ash/shell_delegate.h"
@@ skipping 261 matching lines @@
   virtual void StopSearch() OVERRIDE {
     // Nothing needs to be done.
   }
 
   virtual void Close() OVERRIDE {
     DCHECK(ash::Shell::HasInstance());
     if (Shell::GetInstance()->GetAppListTargetVisibility())
       Shell::GetInstance()->ToggleAppList();
   }
 
+  virtual void ViewClosing() OVERRIDE {
+    // Nothing needs to be done.
+  }
+
+  virtual void ViewActivationChanged(bool active) OVERRIDE {
+    // Nothing needs to be done.
+  }
+
   app_list::AppListModel* model_;
 
   DISALLOW_COPY_AND_ASSIGN(ExampleAppListViewDelegate);
 };
 
 }  // namespace
 
 app_list::AppListViewDelegate* CreateAppListViewDelegate() {
   return new ExampleAppListViewDelegate;
 }
 
 }  // namespace shell
 }  // namespace ash