Enable the FileDescriptorWatcher API on TYPE_IO AutoThreads.

remoting/base/auto_thread.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 "remoting/base/auto_thread.h"
 
+#include <memory>
+
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/run_loop.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_local.h"
 #include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "remoting/base/auto_thread_task_runner.h"
 
+#if defined(OS_POSIX) && !defined(OS_NACL)
+#include "base/files/file_descriptor_watcher_posix.h"
+#endif
+
 #if defined(OS_WIN)
 #include "base/win/scoped_com_initializer.h"
 #endif
 
 namespace remoting {
 
 namespace {
 
 #if defined(OS_WIN)
 std::unique_ptr<base::win::ScopedCOMInitializer> CreateComInitializer(
@@ skipping 166 matching lines @@
   // no more references to it remain.
   startup_data_->task_runner = new AutoThreadTaskRunner(
       message_loop.task_runner(),
       base::Bind(&AutoThread::QuitThread, base::Unretained(this),
                  run_loop.QuitWhenIdleClosure()));
 
   startup_data_->event.Signal();
   // startup_data_ can't be touched anymore since the starting thread is now
   // unlocked.
 
+#if defined(OS_POSIX) && !defined(OS_NACL)
+  // Allow threads running a MessageLoopForIO to use FileDescriptorWatcher.
+  std::unique_ptr<base::FileDescriptorWatcher> file_descriptor_watcher;
+  if (startup_data_->loop_type == base::MessageLoop::TYPE_IO) {

[Wez, 2016/10/04 00:58:06]

You shouldn't access startup_data_ here, since you just signalled the event to
unlock it.  You either need to move this block before the Signal(), or just use
message_loop.type() here.

+    DCHECK_EQ(&message_loop, base::MessageLoopForIO::current());
+    file_descriptor_watcher.reset(
+        new base::FileDescriptorWatcher(base::MessageLoopForIO::current()));
+  }
+#endif
+
 #if defined(OS_WIN)
   // Initialize COM on the thread, if requested.
   std::unique_ptr<base::win::ScopedCOMInitializer> com_initializer(
       CreateComInitializer(com_init_type_));
 #endif
 
   run_loop.Run();
 
   // Assert that MessageLoop::QuitWhenIdle was called by AutoThread::QuitThread.
   DCHECK(was_quit_properly_);
 }
 
 }  // namespace base