Create --disable-extensions-except switch

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 the shared command-line switches used by code in the Chrome
 // directory that don't have anywhere more specific to go.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
 #include "build/build_config.h"
 
 // Don't add more switch files here. This is linked into some places like the
 // installer where dependencies should be limited. Instead, have files
 // directly include your switch file.
 
+namespace base {
+class CommandLine;
+};
+
 namespace switches {
 
 // -----------------------------------------------------------------------------
 // Can't find the switch you are looking for? Try looking in
 // media/base/media_switches.cc or ui/gl/gl_switches.cc or one of the
 // .cc files corresponding to the *_switches.h files included above
 // instead.
 // -----------------------------------------------------------------------------
 
 // All switches in alphabetical order. The switches should be documented
@@ skipping 40 matching lines @@
 extern const char kDisableCastStreamingHWEncoding[];
 extern const char kDisableChildAccountDetection[];
 extern const char kDisableClearBrowsingDataCounters[];
 extern const char kDisableClientSidePhishingDetection[];
 extern const char kDisableComponentExtensionsWithBackgroundPages[];
 extern const char kDisableComponentUpdate[];
 extern const char kDisableDefaultApps[];
 extern const char kDisableDeviceDiscoveryNotifications[];
 extern const char kDisableDomainReliability[];
 extern const char kDisableExtensions[];
+extern const char kDisableExtensionsExcept[];
 extern const char kDisableExtensionsFileAccessCheck[];
 extern const char kDisableExtensionsHttpThrottling[];
 extern const char kDisableFieldTrialTestingConfig[];
 extern const char kDisableHttp2[];
 extern const char kDisableMinimizeOnSecondLauncherItemClick[];
 extern const char kDisableNewBookmarkApps[];
 extern const char kDisableOfflineAutoReload[];
 extern const char kDisableOfflineAutoReloadVisibleOnly[];
 extern const char kDisableOutOfProcessPac[];
 extern const char kDisablePermissionActionReporting[];
@@ skipping 291 matching lines @@
 #if defined(ENABLE_WAYLAND_SERVER)
 extern const char kEnableWaylandServer[];
 #endif
 
 #if defined(OS_WIN) || defined(OS_LINUX)
 extern const char kDisableInputImeAPI[];
 extern const char kEnableInputImeAPI[];
 #endif
 
 bool AboutInSettingsEnabled();
+bool ExtensionsDisabled(const base::CommandLine& command_line);
 bool MdFeedbackEnabled();
 bool MdPolicyPageEnabled();
 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_