Enable non-recursive watches for Windows DirectoryWatcher....

base/directory_watcher.h

 // Copyright (c) 2006-2008 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.
 
 // This module provides a way to monitor a directory for changes.
 
 #ifndef BASE_DIRECTORY_WATCHER_H_
 #define BASE_DIRECTORY_WATCHER_H_
 
 #include "base/basictypes.h"
@@ skipping 11 matching lines @@
     virtual void OnDirectoryChanged(const FilePath& path) = 0;
   };
 
   DirectoryWatcher();
   ~DirectoryWatcher() {}
 
   // Register interest in any changes in the directory |path|.
   // OnDirectoryChanged will be called back for each change within the dir.
   // If |recursive| is true, the delegate will be notified for each change
   // within the directory tree starting at |path|. Returns false on error.
+  //
+  // Note: on Windows the non-recursive watch will also send a notification
+  // when you create a file in a subdirectory (but won't send notifications
+  // for further modifications).
   bool Watch(const FilePath& path, Delegate* delegate, bool recursive) {
     return impl_->Watch(path, delegate, recursive);
   }
 
   // Used internally to encapsulate different members on different platforms.
   class PlatformDelegate : public base::RefCounted<PlatformDelegate> {
    public:
     virtual ~PlatformDelegate() {}
     virtual bool Watch(const FilePath& path, Delegate* delegate,
                        bool recursive) = 0;
   };
 
  private:
   scoped_refptr<PlatformDelegate> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(DirectoryWatcher);
 };
 
 #endif  // BASE_DIRECTORY_WATCHER_H_