Mark supervised users in the "Users" list in about:settings.

chrome/browser/resources/options/browser_options.css

Index: chrome/browser/resources/options/browser_options.css
diff --git a/chrome/browser/resources/options/browser_options.css b/chrome/browser/resources/options/browser_options.css
index ac9230d6714481dfef832f992e59d66ab5c91abe..674abf96aebf0c245927eb2bebf42eaadd8b75a7 100644
--- a/chrome/browser/resources/options/browser_options.css
+++ b/chrome/browser/resources/options/browser_options.css
@@ -87,6 +87,12 @@ html[dir=rtl] #account-picture-wrapper {
   min-height: 0;
 }
 
+#profiles-list .profile-container {
+  -webkit-box-align: center;
+  display: -webkit-box;
+  max-width: 100%;
+}
+
 #profiles-list .profile-name {
   -webkit-box-flex: 1;
   overflow: hidden;
@@ -94,6 +100,11 @@ html[dir=rtl] #account-picture-wrapper {
   white-space: nowrap;
 }
 
+#profiles-list .profile-supervised {
+  color: #999;
+  margin-left: 5px;
+}
+
 #profiles-list > * {
   height: 40px;
 }