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

base/message_loop/message_pump_io_ios_unittest.cc

 // Copyright 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 "base/message_loop/message_pump_io_ios.h"
 
 #include <unistd.h>
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 58 matching lines @@
   ~StupidWatcher() override {}
 
   // base:MessagePumpIOSForIO::Watcher interface
   void OnFileCanReadWithoutBlocking(int fd) override {}
   void OnFileCanWriteWithoutBlocking(int fd) override {}
 };
 
 // Test to make sure that we catch calling WatchFileDescriptor off of the wrong
 // thread.
 TEST_F(MessagePumpIOSForIOTest, TestWatchingFromBadThread) {
-  MessagePumpIOSForIO::FileDescriptorWatcher watcher;
+  MessagePumpIOSForIO::FileDescriptorWatcher watcher(FROM_HERE);
   StupidWatcher delegate;
 
   ASSERT_DCHECK_DEATH(
       io_loop()->WatchFileDescriptor(STDOUT_FILENO, false,
                                      MessageLoopForIO::WATCH_READ, &watcher,
                                      &delegate));
 }
 
 class BaseWatcher : public MessagePumpIOSForIO::Watcher {
  public:
@@ skipping 23 matching lines @@
   void OnFileCanWriteWithoutBlocking(int /* fd */) override {
     DCHECK(controller_);
     delete controller_;
     controller_ = NULL;
   }
 };
 
 TEST_F(MessagePumpIOSForIOTest, DeleteWatcher) {
   std::unique_ptr<MessagePumpIOSForIO> pump(new MessagePumpIOSForIO);
   MessagePumpIOSForIO::FileDescriptorWatcher* watcher =
-      new MessagePumpIOSForIO::FileDescriptorWatcher;
+      new MessagePumpIOSForIO::FileDescriptorWatcher(FROM_HERE);
   DeleteWatcher delegate(watcher);
   pump->WatchFileDescriptor(pipefds_[1],
       false, MessagePumpIOSForIO::WATCH_READ_WRITE, watcher, &delegate);
 
   // Spoof a callback.
   HandleFdIOEvent(watcher);
 }
 
 class StopWatcher : public BaseWatcher {
  public:
@@ skipping 14 matching lines @@
     }
   }
 
  private:
   MessagePumpIOSForIO* pump_;
   int fd_to_start_watching_;
 };
 
 TEST_F(MessagePumpIOSForIOTest, StopWatcher) {
   std::unique_ptr<MessagePumpIOSForIO> pump(new MessagePumpIOSForIO);
-  MessagePumpIOSForIO::FileDescriptorWatcher watcher;
+  MessagePumpIOSForIO::FileDescriptorWatcher watcher(FROM_HERE);
   StopWatcher delegate(&watcher, pump.get());
   pump->WatchFileDescriptor(pipefds_[1],
       false, MessagePumpIOSForIO::WATCH_READ_WRITE, &watcher, &delegate);
 
   // Spoof a callback.
   HandleFdIOEvent(&watcher);
 }
 
 TEST_F(MessagePumpIOSForIOTest, StopWatcherAndWatchSomethingElse) {
   std::unique_ptr<MessagePumpIOSForIO> pump(new MessagePumpIOSForIO);
-  MessagePumpIOSForIO::FileDescriptorWatcher watcher;
+  MessagePumpIOSForIO::FileDescriptorWatcher watcher(FROM_HERE);
   StopWatcher delegate(&watcher, pump.get(), alternate_pipefds_[1]);
   pump->WatchFileDescriptor(pipefds_[1],
       false, MessagePumpIOSForIO::WATCH_READ_WRITE, &watcher, &delegate);
 
   // Spoof a callback.
   HandleFdIOEvent(&watcher);
 }
 
 }  // namespace
 
 }  // namespace base