Mark supervised profiles as such immediately when they're created.

chrome/test/base/testing_profile_manager.cc

 // 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.
 
 #include "chrome/test/base/testing_profile_manager.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_special_storage_policy.h"
 #include "chrome/browser/prefs/pref_service_syncable.h"
@@ skipping 42 matching lines @@
   DCHECK(called_set_up_);
 
   // Create a path for the profile based on the name.
   base::FilePath profile_path(profiles_dir_.path());
   profile_path = profile_path.AppendASCII(profile_name);
 
   // Create the profile and register it.
   TestingProfile::Builder builder;
   builder.SetPath(profile_path);
   builder.SetPrefService(prefs.Pass());
+  builder.SetManagedUserId(managed_user_id);
+
   TestingProfile* profile = builder.Build().release();
   profile_manager_->AddProfile(profile);  // Takes ownership.
 
   // Update the user metadata.
   ProfileInfoCache& cache = profile_manager_->GetProfileInfoCache();
   size_t index = cache.GetIndexOfProfileWithPath(profile_path);
   cache.SetAvatarIconOfProfileAtIndex(index, avatar_id);
   cache.SetManagedUserIdOfProfileAtIndex(index, managed_user_id);
   // SetNameOfProfileAtIndex may reshuffle the list of profiles, so we do it
   // last.
@@ skipping 53 matching lines @@
       << "ProfileManager already exists";
 
   // Set up the directory for profiles.
   ASSERT_TRUE(profiles_dir_.CreateUniqueTempDir());
 
   profile_manager_ = new testing::ProfileManager(profiles_dir_.path());
   browser_process_->SetProfileManager(profile_manager_);  // Takes ownership.
 
   called_set_up_ = true;
 }