Add request_id to HttpRequestInfo and pass it to the NetworkDelegate for events.

net/url_request/url_request.cc

 // Copyright (c) 2010 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 "net/url_request/url_request.h"
 
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
 #include "base/metrics/stats_counters.h"
 #include "base/singleton.h"
@@ skipping 25 matching lines @@
 // Discard headers which have meaning in POST (Content-Length, Content-Type,
 // Origin).
 void StripPostSpecificHeaders(net::HttpRequestHeaders* headers) {
   // These are headers that may be attached to a POST.
   headers->RemoveHeader(net::HttpRequestHeaders::kContentLength);
   headers->RemoveHeader(net::HttpRequestHeaders::kContentType);
   headers->RemoveHeader(net::HttpRequestHeaders::kOrigin);
 }
 
 // This counter keeps track of the identifiers used for URL requests so far.
-uint64 g_next_url_request_identifier = 0;
+// 0 is reserved to represent an invalid ID.
+uint64 g_next_url_request_identifier = 1;
 
 // This lock protects g_next_url_request_identifier.
 base::Lock g_next_url_request_identifier_lock;
 
 // Returns an prior unused identifier for URL requests.
 uint64 GenerateURLRequestIdentifier() {
   base::AutoLock lock(g_next_url_request_identifier_lock);
   return g_next_url_request_identifier++;
 }
 
@@ skipping 607 matching lines @@
   if (found != user_data_.end())
     return found->second.get();
   return NULL;
 }
 
 void URLRequest::SetUserData(const void* key, UserData* data) {
   user_data_[key] = linked_ptr<UserData>(data);
 }
 
 }  // namespace net