Access fields from the appropriate threads in FilePathWatcherFSEvents.

base/files/file_path_watcher_fsevents.h

 // Copyright 2014 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.
 
 #ifndef BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
 #define BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
 
 #include <CoreServices/CoreServices.h>
 
 #include <vector>
@@ skipping 30 matching lines @@
              const FilePathWatcher::Callback& callback) override;
   void Cancel() override;
 
  private:
   ~FilePathWatcherFSEvents() override;
 
   // Destroy the event stream.
   void DestroyEventStream();
 
   // Start watching the FSEventStream.
-  void StartEventStream(FSEventStreamEventId start_event);
+  void StartEventStream(FSEventStreamEventId start_event,
+                        const FilePath& path,
+                        const FilePathWatcher::Callback& callback);
 
   // Cleans up and stops the event stream.
   void CancelOnMessageLoopThread() override;
 
   // Callback to notify upon changes.

[Mattias Nissler (ping if slow), 2015/04/02 17:35:45]

Please also document here which thread the members should be accessed from so
people touching this file in the future will actually have a chance to obey the
rules :)

   FilePathWatcher::Callback callback_;
 
   // Target path to watch (passed to callback).
   FilePath target_;
 
   // Target path with all symbolic links resolved.
   FilePath resolved_target_;
 
   // Backend stream we receive event callbacks from (strong reference).
   FSEventStreamRef fsevent_stream_;
 
   DISALLOW_COPY_AND_ASSIGN(FilePathWatcherFSEvents);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_