Use the location where FileDescriptorWatcher is created to track the libevent handlers

chrome/common/service_process_util_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 "chrome/common/service_process_util_posix.h"
 
 #include <string.h>
 
 #include <utility>
 
@@ skipping 62 matching lines @@
 // not, but we don't ever expect it to be called.
 static void SigTermHandler(int sig, siginfo_t* info, void* uap) {
   // TODO(dmaclach): add security here to make sure that we are being shut
   //                 down by an appropriate process.
   int message = ServiceProcessTerminateMonitor::kTerminateMessage;
   if (write(g_signal_socket, &message, sizeof(message)) < 0) {
     DPLOG(ERROR) << "write";
   }
 }
 
-ServiceProcessState::StateData::StateData() : set_action(false) {
+ServiceProcessState::StateData::StateData()
+    : watcher(FROM_HERE), set_action(false) {
   memset(sockets, -1, sizeof(sockets));
   memset(&old_action, 0, sizeof(old_action));
 }
 
 void ServiceProcessState::StateData::SignalReady(base::WaitableEvent* signal,
                                                  bool* success) {
   DCHECK(task_runner->BelongsToCurrentThread());
   DCHECK_EQ(g_signal_socket, -1);
   DCHECK(!signal->IsSignaled());
   *success = base::MessageLoopForIO::current()->WatchFileDescriptor(
@@ skipping 101 matching lines @@
   return success;
 }
 
 void ServiceProcessState::TearDownState() {
   if (state_ && state_->task_runner)
     state_->task_runner->DeleteSoon(FROM_HERE, state_);
   else
     delete state_;
   state_ = nullptr;
 }