[net/http auth] Use strings to identify authentication schemes.

net/log/net_log_event_type_list.h

 // 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.
 
 // NOTE: No header guards are used, since this file is intended to be expanded
 // directly into net_log.h. DO NOT include this file anywhere else.
 
 // In the event of a failure, a many end events will have a |net_error|
 // parameter with the integer error code associated with the failure.  Most
 // of these parameters are not individually documented.
@@ skipping 1778 matching lines @@
 // ------------------------------------------------------------------------
 // HTTP Authentication
 // ------------------------------------------------------------------------
 
 // The time spent authenticating to the proxy.
 EVENT_TYPE(AUTH_PROXY)
 
 // The time spent authentication to the server.
 EVENT_TYPE(AUTH_SERVER)
 
+// Unexepcted failure while trying to create an HttpAuthhandler.
+//   {
+//     "challenge": <Authentication challenge that caused the failure>,
+//     "net_error": <net::Error>
+//   }
+EVENT_TYPE(AUTH_HANDLER_CREATION_FAILURE)
+
 // ------------------------------------------------------------------------
 // HTML5 Application Cache
 // ------------------------------------------------------------------------
 
 // This event is emitted whenever a request is satisfied directly from
 // the appcache.
 EVENT_TYPE(APPCACHE_DELIVERING_CACHED_RESPONSE)
 
 // This event is emitted whenever the appcache uses a fallback response.
 EVENT_TYPE(APPCACHE_DELIVERING_FALLBACK_RESPONSE)
@@ skipping 853 matching lines @@
 // The start/end of some portion of the SAFE_BROWSING_CHECKING_URL during which
 // the request is delayed due to that check.
 //
 // The BEGIN phase contains the following parameters:
 //  {
 //    "url": <The URL being checked>,
 //    "defer_reason" : < "at_start", "at_response", "redirect",
 //                       "resumed_redirect", "unchecked_redirect">
 //  }
 EVENT_TYPE(SAFE_BROWSING_DEFERRED)