Auto hide app list on Windows when it loses focus.

ui/app_list/app_list_view_delegate.h

 // 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.
 
 #ifndef UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 
 #include "ui/app_list/app_list_export.h"
 
 namespace app_list {
@@ skipping 28 matching lines @@
                                 int event_flags) = 0;
 
   // Called to invoke a custom action on |result|.  |action_index| corresponds
   // to the index of an icon in |result.action_icons()|.
   virtual void InvokeSearchResultAction(const SearchResult& result,
                                         int action_index,
                                         int event_flags) = 0;
 
   // Invoked to close app list.
   virtual void Close() = 0;
+
+  // Invoked when the app list is closing.
+  virtual void ViewClosing() = 0;
+
+  // Invoked when the app list's activated state changes.
+  virtual void ViewActivationChanged(bool active) = 0;
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_