Create --disable-extensions-except switch

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 706e9375f094eb8c7fa17b1ecfab393fcf7db01d..e53bd9181a55b1d1b00674c74b78e6d27b8a3c0d 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -221,6 +221,9 @@ const char kDisableDomainReliability[]      = "disable-domain-reliability";
 // Disable extensions.
 const char kDisableExtensions[]             = "disable-extensions";
 
+// Disable extensions except those specified in a comma-separated list.
+const char kDisableExtensionsExcept[] = "disable-extensions-except";
+
 // Disable checking for user opt-in for extensions that want to inject script
 // into file URLs (ie, always allow it). This is used during automated testing.
 const char kDisableExtensionsFileAccessCheck[] =
@@ -1291,6 +1294,11 @@ bool AboutInSettingsEnabled() {
              ::switches::kDisableAboutInSettings);
 }
 
+bool ExtensionsDisabled(const base::CommandLine& command_line) {
+  return command_line.HasSwitch(switches::kDisableExtensions) ||
+         command_line.HasSwitch(switches::kDisableExtensionsExcept);
+}
+
 bool MdFeedbackEnabled() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       ::switches::kEnableMaterialDesignFeedback);