Adding a menu item to take a screenshot under "More Tools" submenu in the Wrench menu.

chrome/app/chrome_command_ids.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 CHROME_APP_CHROME_COMMAND_IDS_H_
 #define CHROME_APP_CHROME_COMMAND_IDS_H_
 
 // This file lists all the command IDs understood by e.g. the browser.
 // It is used by Windows RC files, Mac NIB files, and other platforms too.
 
@@ skipping 191 matching lines @@
 #define IDC_SHOW_SETTINGS_CHANGE_LAST   40133
 #define IDC_SHOW_AVATAR_MENU            40134
 #define IDC_EXTENSION_DISABLED_FIRST    40135
 #define IDC_EXTENSION_DISABLED_LAST     40235
 #define IDC_TOGGLE_REQUEST_TABLET_SITE  40236
 #define IDC_DEV_TOOLS_TOGGLE            40237
 #define IDC_EXTERNAL_EXTENSION_ALERT    40238
 #define IDC_RECENT_TABS_MENU            40239
 #define IDC_RECENT_TABS_NO_DEVICE_TABS  40240
 #define IDC_SHOW_SETTINGS_RESET_BUBBLE  40241
+#define IDC_TAKE_SCREENSHOT             40242
 
 // Spell-check
 // Insert any additional suggestions before _LAST; these have to be consecutive.
 #define IDC_SPELLCHECK_SUGGESTION_0     41000
 #define IDC_SPELLCHECK_SUGGESTION_1     41001
 #define IDC_SPELLCHECK_SUGGESTION_2     41002
 #define IDC_SPELLCHECK_SUGGESTION_3     41003
 #define IDC_SPELLCHECK_SUGGESTION_4     41004
 #define IDC_SPELLCHECK_SUGGESTION_LAST  IDC_SPELLCHECK_SUGGESTION_4
 #define IDC_SPELLCHECK_MENU             41005
@@ skipping 133 matching lines @@
 
 // Protocol handler menu entries
 #define IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_FIRST     52000
 #define IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_LAST      52199
 #define IDC_CONTENT_CONTEXT_PROTOCOL_HANDLER_SETTINGS  52200
 
 // NOTE: The last valid command value is 57343 (0xDFFF)
 // See http://msdn.microsoft.com/en-us/library/t2zechd4(VS.71).aspx
 
 #endif  // CHROME_APP_CHROME_COMMAND_IDS_H_