[fsp] Implement storage::WatcherManager for FSP.

chrome/browser/chromeos/file_system_provider/fileapi/watcher_manager.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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_WATCHER_MANAGER_H_
+#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_WATCHER_MANAGER_H_
+
+#include "storage/browser/fileapi/watcher_manager.h"
+
+namespace storage {
+class FileSystemURL;
+}  // namespace storage
+
+namespace chromeos {
+namespace file_system_provider {
+
+// Exposes entry watching capability to fileapi.
+class WatcherManager : public storage::WatcherManager {
+ public:
+  WatcherManager();
+  virtual ~WatcherManager();
+
+  // storage::WatcherManager overrides.
+  virtual void AddWatcher(
+      const storage::FileSystemURL& url,
+      bool recursive,
+      const StatusCallback& callback,
+      const NotificationCallback& notification_callback) override;
+  virtual void RemoveWatcher(const storage::FileSystemURL& url,
+                             bool recursive,
+                             const StatusCallback& callback) override;
+};
+
+}  // namespace file_system_provider
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FILEAPI_WATCHER_MANAGER_H_