Add avatar syncing for supervised users.

chrome/browser/managed_mode/managed_user_constants.cc

 // Copyright 2013 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/browser/managed_mode/managed_user_constants.h"
 
 namespace managed_users {
 
 const char kContentPackDefaultFilteringBehavior[] =
     "ContentPackDefaultFilteringBehavior";
 const char kContentPackManualBehaviorHosts[] = "ContentPackManualBehaviorHosts";
 const char kContentPackManualBehaviorURLs[] = "ContentPackManualBehaviorURLs";
 const char kForceSafeSearch[] = "ForceSafeSearch";
 const char kSigninAllowed[] = "SigninAllowed";
 const char kUserName[] = "UserName";
 
 const char kUserPasswordRecord[] = "UserPasswordRecord";
 
 const char kManagedUserPseudoEmail[] = "managed_user@localhost";
 
+const char kChromeAvatarIndex[] = "chrome-avatar-index";
+const char kChromeOSAvatarIndex[] = "chromeos-avatar-index";
+
 }  // namespace managed_users