Standardize "net" category trace events

net/dns/host_resolver_impl.cc

 // 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.
 
 #include "net/dns/host_resolver_impl.h"
 
 #if defined(OS_WIN)
 #include <Winsock2.h>
 #elif defined(OS_POSIX)
 #include <netdb.h>
@@ skipping 43 matching lines @@
 #include "net/dns/dns_transaction.h"
 #include "net/dns/dns_util.h"
 #include "net/dns/host_resolver_proc.h"
 #include "net/log/net_log.h"
 #include "net/log/net_log_capture_mode.h"
 #include "net/log/net_log_event_type.h"
 #include "net/log/net_log_parameters_callback.h"
 #include "net/log/net_log_source.h"
 #include "net/log/net_log_source_type.h"
 #include "net/log/net_log_with_source.h"
+#include "net/log/trace_constants.h"
 #include "net/socket/client_socket_factory.h"
 #include "net/socket/datagram_client_socket.h"
 #include "url/url_canon_ip.h"
 
 #if defined(OS_WIN)
 #include "net/base/winsock_init.h"
 #endif
 
 namespace net {
 
@@ skipping 689 matching lines @@
     params_.unresponsive_delay *= params_.retry_factor;
     StartLookupAttempt();
   }
 
   // Callback for when DoLookup() completes (runs on task runner thread).
   void OnLookupComplete(const AddressList& results,
                         const base::TimeTicks& start_time,
                         const uint32_t attempt_number,
                         int error,
                         const int os_error) {
-    TRACE_EVENT0("net", "ProcTask::OnLookupComplete");
+    TRACE_EVENT0(kNetTracingCategory, "ProcTask::OnLookupComplete");
     DCHECK(network_task_runner_->BelongsToCurrentThread());
     // If results are empty, we should return an error.
     bool empty_list_on_ok = (error == OK && results.empty());
     UMA_HISTOGRAM_BOOLEAN("DNS.EmptyAddressListAndNoError", empty_list_on_ok);
     if (empty_list_on_ok)
       error = ERR_NAME_NOT_RESOLVED;
 
     bool was_retry_attempt = attempt_number > 1;
 
     // Ideally the following code would be part of host_resolver_proc.cc,
@@ skipping 1825 matching lines @@
   if (job_)
     job_->CancelRequest(this);
 }
 
 void HostResolverImpl::RequestImpl::ChangeRequestPriority(
     RequestPriority priority) {
   job_->ChangeRequestPriority(this, priority);
 }
 
 }  // namespace net