Allow extensions to specify that they are not allowed in incognito mode.

extensions/browser/extension_util.cc

Index: extensions/browser/extension_util.cc
diff --git a/extensions/browser/extension_util.cc b/extensions/browser/extension_util.cc
index d8dbe62e8396654c32c122d2938ac9d77102f2b1..23de13057948d4202e70473872f8961d63ec582e 100644
--- a/extensions/browser/extension_util.cc
+++ b/extensions/browser/extension_util.cc
@@ -7,6 +7,7 @@
 #include "extensions/browser/extension_prefs.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/manifest_handlers/app_isolation_info.h"
+#include "extensions/common/manifest_handlers/incognito_info.h"
 
 namespace extensions {
 namespace util {
@@ -48,5 +49,11 @@ bool SiteHasIsolatedStorage(const GURL& extension_site_url,
   return extension && AppIsolationInfo::HasIsolatedStorage(extension);
 }
 
+bool CanBeIncognitoEnabled(const Extension* extension) {
+  return IncognitoInfo::IsIncognitoAllowed(extension) &&
+         (!extension->is_platform_app() ||
+          extension->location() == Manifest::COMPONENT);
+}
+
 }  // namespace util
 }  // namespace extensions