Add a menu item to content_shell to open devtools to make it more discoverable.

chrome/common/chrome_switches.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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
 #include "build/build_config.h"
@@ skipping 284 matching lines @@
 extern const char kProtector[];
 extern const char kProxyAutoDetect[];
 extern const char kProxyBypassList[];
 extern const char kProxyPacUrl[];
 extern const char kProxyServer[];
 extern const char kPurgeMemoryButton[];
 extern const char kRecordStats[];
 extern const char kRecordMode[];
 extern const char kReloadKilledTabs[];
 extern const char kRemoteDebuggingFrontend[];
+extern const char kRemoteDebuggingPort[];
 extern const char kRendererPrintPreview[];
 extern const char kResetVariationState[];
 extern const char kRestoreLastSession[];
 extern const char kSavePageAsMHTML[];
 extern const char kSbURLPrefix[];
 extern const char kSbDisableAutoUpdate[];
 extern const char kSbDisableDownloadProtection[];
 extern const char kSearchInOmniboxHint[];
 extern const char kServiceAccountLsid[];
 extern const char kSetToken[];
@@ skipping 129 matching lines @@
 #else
 extern const char kEnablePrintPreview[];
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_