Add extension API to change window show state using chrome.windows.update().

chrome/browser/extensions/extension_tab_util.h

 // Copyright (c) 2011 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_UTIL_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_UTIL_H__
 #pragma once
 
 #include <string>
 
@@ skipping 13 matching lines @@
  public:
   static int GetWindowId(const Browser* browser);
   static int GetWindowIdOfTabStripModel(const TabStripModel* tab_strip_model);
   static int GetTabId(const TabContents* tab_contents);
   static bool GetTabIdFromArgument(const base::ListValue &args,
                                    int argument_index,
                                    int *tab_id, std::string* error_message);
   static std::string GetTabStatusText(bool is_loading);
   static int GetWindowIdOfTab(const TabContents* tab_contents);
   static std::string GetWindowTypeText(const Browser* browser);
+  static std::string GetWindowShowStateText(const Browser* browser);
   static base::ListValue* CreateTabList(const Browser* browser);
   static base::DictionaryValue* CreateTabValue(
       const TabContents* tab_contents);
   static base::DictionaryValue* CreateTabValue(const TabContents* tab_contents,
                                                TabStripModel* tab_strip,
                                                int tab_index);
   // Create a tab value, overriding its kSelectedKey to the provided boolean.
   static base::DictionaryValue* CreateTabValueActive(
       const TabContents* tab_contents,
       bool active);
   static base::DictionaryValue* CreateWindowValue(const Browser* browser,
                                                   bool populate_tabs);
   // Gets the |tab_strip_model| and |tab_index| for the given |tab_contents|.
   static bool GetTabStripModel(const TabContents* tab_contents,
                                TabStripModel** tab_strip_model,
                                int* tab_index);
   static bool GetDefaultTab(Browser* browser,
                             TabContentsWrapper** contents,
                             int* tab_id);
   // Any out parameter (|browser|, |tab_strip|, |contents|, & |tab_index|) may
   // be NULL and will not be set within the function.
   static bool GetTabById(int tab_id, Profile* profile, bool incognito_enabled,
                          Browser** browser,
                          TabStripModel** tab_strip,
                          TabContentsWrapper** contents,
                          int* tab_index);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_UTIL_H__