Add a FileWatcher to base/.

base/file_watcher_stub.cc

+// Copyright (c) 2009 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 file exists for Linux systems which don't have the inotify headers, and
+// thus cannot build file_watcher_inotify.cc
+
+#include "base/file_watcher.h"
+
+class FileWatcherImpl : public FileWatcher::PlatformDelegate {
+ public:
+  virtual bool Watch(const FilePath& path, FileWatcher::Delegate* delegate,
+                     MessageLoop* backend_loop) {
+    return false;
+  }
+};
+
+FileWatcher::FileWatcher() {
+  impl_ = new FileWatcherImpl();
+}