[Extensions Page MD] Stub out a materialized extensions page

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 114 matching lines @@
 extern const char kEnableDownloadNotification[];
 extern const char kEnableDomainReliability[];
 extern const char kEnableEphemeralAppsInWebstore[];
 extern const char kEnableExperimentalHotwordHardware[];
 extern const char kEnableExtensionActivityLogging[];
 extern const char kEnableExtensionActivityLogTesting[];
 extern const char kEnableFastUnload[];
 extern const char kEnableFeatures[];
 extern const char kEnableInsecureQuic[];
 extern const char kEnableMaterialDesignDownloads[];
+extern const char kEnableMaterialDesignExtensions[];
 extern const char kEnableMaterialDesignSettings[];
 extern const char kEnableMediaRouter[];
 extern const char kEnableNaCl[];
 extern const char kEnableNavigationTracing[];
 extern const char kEnableNetBenchmarking[];
 extern const char kEnableNewBookmarkApps[];
 extern const char kEnableNTPPopularSites[];
 extern const char kEnableOfflineAutoReload[];
 extern const char kEnableOfflineAutoReloadVisibleOnly[];
 extern const char kEnablePanels[];
@@ skipping 249 matching lines @@
 extern const char kAllowNaClSocketAPI[];
 extern const char kDisablePluginPowerSaver[];
 extern const char kEnablePluginPowerSaver[];
 #endif
 
 #if defined(ENABLE_TASK_MANAGER)
 extern const char kDisableNewTaskManager[];
 #endif  // defined(ENABLE_TASK_MANAGER)
 
 bool AboutInSettingsEnabled();
+bool MdExtensionsEnabled();
 bool MdSettingsEnabled();
 bool MediaRouterEnabled();
 bool PdfMaterialUIEnabled();
 bool SettingsWindowEnabled();
 
 #if defined(OS_CHROMEOS)
 bool PowerOverlayEnabled();
 #endif
 
 #if defined(ENABLE_TASK_MANAGER)
 bool NewTaskManagerEnabled();
 #endif  // defined(ENABLE_TASK_MANAGER)
 
 // 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_