Allow FilePathWatcher to be used from sequenced tasks.

base/files/file_path_watcher_win.cc

 // Copyright (c) 2011 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/files/file_path_watcher.h"
 
 #include "base/bind.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/thread_task_runner_handle.h"
+#include "base/threading/sequenced_task_runner_handle.h"
 #include "base/time/time.h"
 #include "base/win/object_watcher.h"
 
 namespace base {
 
 namespace {
 
 class FilePathWatcherImpl : public FilePathWatcher::PlatformDelegate,
                             public base::win::ObjectWatcher::Delegate {
  public:
@@ skipping 51 matching lines @@
   Time first_notification_;
 
   DISALLOW_COPY_AND_ASSIGN(FilePathWatcherImpl);
 };
 
 bool FilePathWatcherImpl::Watch(const FilePath& path,
                                 bool recursive,
                                 const FilePathWatcher::Callback& callback) {
   DCHECK(target_.value().empty());  // Can only watch one path.
 
-  set_task_runner(ThreadTaskRunnerHandle::Get());
+  set_task_runner(SequencedTaskRunnerHandle::Get());
   callback_ = callback;
   target_ = path;
   recursive_watch_ = recursive;
 
   File::Info file_info;
   if (GetFileInfo(target_, &file_info)) {
     last_modified_ = file_info.last_modified;
     first_notification_ = Time::Now();
   }
 
   if (!UpdateWatch())
     return false;
 
   watcher_.StartWatchingOnce(handle_, this);
 
   return true;
 }
 
 void FilePathWatcherImpl::Cancel() {
   if (callback_.is_null()) {
     // Watch was never called, or the |task_runner_| has already quit.
     set_cancelled();
     return;
   }
 
-  DCHECK(task_runner()->BelongsToCurrentThread());
+  DCHECK(task_runner()->RunsTasksOnCurrentThread());
   set_cancelled();
 
   if (handle_ != INVALID_HANDLE_VALUE)
     DestroyWatch();
 
   callback_.Reset();
 }
 
 void FilePathWatcherImpl::OnObjectSignaled(HANDLE object) {
   DCHECK(object == handle_);
@@ skipping 143 matching lines @@
 }
 
 }  // namespace
 
 FilePathWatcher::FilePathWatcher() {
   sequence_checker_.DetachFromSequence();
   impl_ = new FilePathWatcherImpl();
 }
 
 }  // namespace base