[net/http auth] Make HttpAuthHandler challenge handling asynchronous.

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 1064 matching lines @@
 //   {
 //     "headers": <The list of header:value pairs>,
 //     "quic_priority": <Integer representing the priority of this request>,
 //     "quic_stream_id": <Id of the QUIC stream sending this request>,
 //   }
 EVENT_TYPE(HTTP_TRANSACTION_QUIC_SEND_REQUEST_HEADERS)
 
 // Measures the time to read HTTP response headers from the server.
 EVENT_TYPE(HTTP_TRANSACTION_READ_HEADERS)
 
+// Measures the time to handle an HTTP authentication challenge.
+EVENT_TYPE(HTTP_TRANSACTION_HANDLE_AUTH_CHALLENGE)
+
 // This event is sent on receipt of the HTTP response headers.
 // The following parameters are attached:
 //   {
 //     "headers": <The list of header:value pairs>,
 //   }
 EVENT_TYPE(HTTP_TRANSACTION_READ_RESPONSE_HEADERS)
 
 // Measures the time to read the entity body from the server.
 EVENT_TYPE(HTTP_TRANSACTION_READ_BODY)
 
@@ skipping 1574 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)