Show modal dialog to tell users that the profile is managed when it's the case.

chrome/common/extensions/api/developer_private.idl

Index: chrome/common/extensions/api/developer_private.idl
diff --git a/chrome/common/extensions/api/developer_private.idl b/chrome/common/extensions/api/developer_private.idl
index 9329723589eed51372379a77fd2f670915c8e270..77f435a431c6161c19d5a88cfbf322ba787f0816 100644
--- a/chrome/common/extensions/api/developer_private.idl
+++ b/chrome/common/extensions/api/developer_private.idl
@@ -207,6 +207,9 @@ namespace developerPrivate {
     // strings as a dictionary mapping from string identifier to the
     // translated string to use in the apps_debugger app UI.
     static void getStrings(GetStringsCallback callback);
+
+    // Returns true if the profile is managed.
+    static void isProfileManaged(BooleanCallback callback);
   };
 
   interface Events {