Add "inspect background page" to platform app right-click 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 270 matching lines @@
 #define IDC_CONTENT_CONTEXT_INSPECTELEMENT 50151
 #define IDC_CONTENT_CONTEXT_VIEWPAGEINFO 50152
 #define IDC_CONTENT_CONTEXT_LANGUAGE_SETTINGS 50153
 #define IDC_CONTENT_CONTEXT_LOOK_UP_IN_DICTIONARY 50154
 #define IDC_CONTENT_CONTEXT_NO_SPELLING_SUGGESTIONS 50155
 #define IDC_CONTENT_CONTEXT_SPELLING_SUGGESTION 50156
 #define IDC_CONTENT_CONTEXT_SPELLING_TOGGLE 50157
 #define IDC_CONTENT_CONTEXT_SPEECH_MENU 50158
 #define IDC_CONTENT_CONTEXT_SPEECH_START_SPEAKING 50159
 #define IDC_CONTENT_CONTEXT_SPEECH_STOP_SPEAKING 50160
+#define IDC_CONTENT_CONTEXT_INSPECTBACKGROUNDPAGE 50161
 // Frame items.
 #define IDC_CONTENT_CONTEXT_RELOADFRAME 50170
 #define IDC_CONTENT_CONTEXT_VIEWFRAMESOURCE 50171
 #define IDC_CONTENT_CONTEXT_VIEWFRAMEINFO 50172
 // Search items.
 #define IDC_CONTENT_CONTEXT_GOTOURL 50180
 #define IDC_CONTENT_CONTEXT_SEARCHWEBFOR 50181
 #define IDC_CONTENT_CONTEXT_ADDSEARCHENGINE 50182
 
 // Context menu items in the bookmark bar
@@ skipping 25 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_