Server push cancellation: add NetLogs to track cache lookup transaction

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 1285 matching lines @@
 EVENT_TYPE(BIDIRECTIONAL_STREAM_READY)
 
 // This event is used when stream has failed.
 // The following parameters are attached:
 //   {
 //     "net_error": <Net error code for the failure>,
 //   }
 EVENT_TYPE(BIDIRECTIONAL_STREAM_FAILED)
 
 // ------------------------------------------------------------------------
+// SERVER_PUSH_LOOKUP_TRANSACTION
+// ------------------------------------------------------------------------
+
+// The start/end of a push lookup transaction for server push.
+//
+// The START event has the parameters:
+//   {
+//     "source_dependency": <Source identifier for the server push lookp.
+//                           It can be a QUIC_SESSION or a HTTP2_SESSION>,
+//     "pushed_url": <The url that has been pushed and looked up>,
+//   }
+//
+//   If the transaction doesn't find the resource in cache, then the END phase

[eroman, 2017/02/11 02:44:36]

nit: de-indent this by two spaces?

[Zhongyi Shi, 2017/02/11 09:42:26]

Done. I forgot to upload the patch set which fixes the typo. 

+//   has these parameters:
+//   {
+//     "net_error": <Net error code integer>,
+//   }
+EVENT_TYPE(SERVER_PUSH_LOOKUP_TRANSACTION)
+
+// ------------------------------------------------------------------------
 // SpdySession
 // ------------------------------------------------------------------------
 
 // The start/end of a SpdySession.
 //   {
 //     "host": <The host-port string>,
 //     "proxy": <The Proxy PAC string>,
 //   }
 EVENT_TYPE(HTTP2_SESSION)
 
@@ skipping 1784 matching lines @@
 // quality of the network has changed.
 // parameters:
 //  {
 //    "http_rtt": <Current estimate of the HTTP RTT>,
 //    "transport_rtt": <Current estimate of the transport RTT>,
 //    "downstream_throughput": <Current estimate of the downstream throughput>,
 //    "effective_connection_type": <Current estimate of the effective connection
 //                                  type>,
 //  }
 EVENT_TYPE(NETWORK_QUALITY_CHANGED)