Add a basic stub Polymer settings page at chrome://md-settings.

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 379 matching lines @@
 extern const char kAllowNaClCrxFsAPI[];
 extern const char kAllowNaClFileHandleAPI[];
 extern const char kAllowNaClSocketAPI[];
 #endif
 
 #ifndef NDEBUG
 extern const char kFileManagerExtensionPath[];
 #endif
 
 bool AboutInSettingsEnabled();
+bool MdSettingsEnabled();
 bool NewOfflineErrorPageEnabled();
 bool OutOfProcessPdfEnabled();
 bool PdfMaterialUIEnabled();
 bool SettingsWindowEnabled();
 
 #if defined(OS_CHROMEOS)
 bool PowerOverlayEnabled();
 #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_