[NOT FOR REVIEW] Instrument net/ with trace events.

net/base/address_tracker_linux.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/base/address_tracker_linux.h"
 
 #include <errno.h>
 #include <linux/if.h>
 #include <stdint.h>
 #include <sys/ioctl.h>
 
 #include "base/files/scoped_file.h"
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/threading/thread_restrictions.h"
 #include "net/base/network_interfaces_linux.h"
 
+#include "base/trace_event/trace_event.h"
+
 namespace net {
 namespace internal {
 
 namespace {
 
 // Some kernel functions such as wireless_send_event and rtnetlink_ifinfo_prep
 // may send spurious messages over rtnetlink. RTM_NEWLINK messages where
 // ifi_change == 0 and rta_type == IFLA_WIRELESS should be ignored.
 bool IgnoreWirelessChange(const struct nlmsghdr* header,
                           const struct ifinfomsg* msg) {
@@ skipping 378 matching lines @@
             *tunnel_changed = true;
         }
       } break;
       default:
         break;
     }
   }
 }
 
 void AddressTrackerLinux::OnFileCanReadWithoutBlocking(int fd) {
+  TRACE_EVENT0("net", "net::AddressTrackerLinux::OnFileCanReadWithoutBlocking");
   DCHECK_EQ(netlink_fd_, fd);
   bool address_changed;
   bool link_changed;
   bool tunnel_changed;
   ReadMessages(&address_changed, &link_changed, &tunnel_changed);
   if (address_changed)
     address_callback_.Run();
   if (link_changed)
     link_callback_.Run();
   if (tunnel_changed)
@@ skipping 64 matching lines @@
 
 AddressTrackerLinux::AddressTrackerAutoLock::~AddressTrackerAutoLock() {
   if (tracker_.tracking_) {
     lock_.AssertAcquired();
     lock_.Release();
   }
 }
 
 }  // namespace internal
 }  // namespace net