Standardize "net" category trace events

net/socket/udp_socket_posix.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/socket/udp_socket_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <net/if.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 
 #include "base/callback.h"
 #include "base/debug/alias.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/rand_util.h"
 #include "base/trace_event/trace_event.h"
 #include "net/base/io_buffer.h"
 #include "net/base/ip_address.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
 #include "net/base/network_activity_monitor.h"
 #include "net/base/sockaddr_storage.h"
+#include "net/base/trace_constants.h"
 #include "net/log/net_log.h"
 #include "net/log/net_log_event_type.h"
 #include "net/log/net_log_source.h"
 #include "net/log/net_log_source_type.h"
 #include "net/socket/socket_descriptor.h"
 #include "net/socket/udp_net_log_parameters.h"
 
 #if defined(OS_ANDROID)
 #include <dlfcn.h>
 // This was added in Lollipop to dlfcn.h
@@ skipping 527 matching lines @@
   rv = setsockopt(socket_, SOL_SOCKET, SO_REUSEPORT, &value, sizeof(value));
   if (rv != 0)
     return MapSystemError(errno);
 #endif  // defined(OS_MACOSX)
   rv = setsockopt(socket_, SOL_SOCKET, SO_BROADCAST, &value, sizeof(value));
 
   return rv == 0 ? OK : MapSystemError(errno);
 }
 
 void UDPSocketPosix::ReadWatcher::OnFileCanReadWithoutBlocking(int) {
-  TRACE_EVENT0("net",
+  TRACE_EVENT0(kNetTracingCategory,
                "UDPSocketPosix::ReadWatcher::OnFileCanReadWithoutBlocking");
   if (!socket_->read_callback_.is_null())
     socket_->DidCompleteRead();
 }
 
 void UDPSocketPosix::WriteWatcher::OnFileCanWriteWithoutBlocking(int) {
   if (!socket_->write_callback_.is_null())
     socket_->DidCompleteWrite();
 }
 
@@ skipping 374 matching lines @@
     return MapSystemError(errno);
 
   return OK;
 }
 
 void UDPSocketPosix::DetachFromThread() {
   base::NonThreadSafe::DetachFromThread();
 }
 
 }  // namespace net