[fsp] Implement storage::WatcherManager for FSP.

chrome/browser/chromeos/file_system_provider/provided_file_system_interface.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_PROVIDED_FILE_SYSTEM_INTERFACE_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_observer.h"
 #include "chrome/browser/chromeos/file_system_provider/watcher.h"
 #include "storage/browser/fileapi/async_file_util.h"
+#include "storage/browser/fileapi/watcher_manager.h"
 #include "url/gurl.h"
 
 class EventRouter;
 
 namespace base {
 class Time;
 }  // namespace base
 
 namespace net {
 class IOBuffer;
@@ skipping 140 matching lines @@
 
   // Requests writing to a file previously opened with |file_handle|.
   virtual AbortCallback WriteFile(
       int file_handle,
       net::IOBuffer* buffer,
       int64 offset,
       int length,
       const storage::AsyncFileUtil::StatusCallback& callback) = 0;
 
   // Requests adding a watcher on an entry. |recursive| must not be true for
-  // files.
+  // files. |callback| is optional, but it can't be used for persistent
+  // watchers.
   virtual AbortCallback AddWatcher(
       const GURL& origin,
       const base::FilePath& entry_path,
       bool recursive,
       bool persistent,
-      const storage::AsyncFileUtil::StatusCallback& callback) = 0;
+      const storage::AsyncFileUtil::StatusCallback& callback,
+      const storage::WatcherManager::NotificationCallback&
+          notification_callback) = 0;
 
   // Requests removing a watcher, which is immediately deleted from the internal
   // list, hence the operation is not abortable.
   virtual void RemoveWatcher(
       const GURL& origin,
       const base::FilePath& entry_path,
       bool recursive,
       const storage::AsyncFileUtil::StatusCallback& callback) = 0;
 
   // Notifies about changes related to the watcher within the file system.
   // Invoked by the file system implementation. Returns false if the
   // notification arguments are malformed or the entry is not watched anymore.
   // TODO(mtomasz): Replace [entry_path, recursive] with a watcher id.
   virtual bool Notify(const base::FilePath& entry_path,
                       bool recursive,
-                      ProvidedFileSystemObserver::ChangeType change_type,
+                      storage::WatcherManager::ChangeType change_type,
                       scoped_ptr<ProvidedFileSystemObserver::Changes> changes,
                       const std::string& tag) = 0;
 
   // Returns a provided file system info for this file system.
   virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const = 0;
 
   // Returns a mutable list of watchers.
   virtual Watchers* GetWatchers() = 0;
 
   // Returns a request manager for the file system.
   virtual RequestManager* GetRequestManager() = 0;
 
   // Adds an observer on the file system.
   virtual void AddObserver(ProvidedFileSystemObserver* observer) = 0;
 
   // Removes an observer.
   virtual void RemoveObserver(ProvidedFileSystemObserver* observer) = 0;
 
   // Returns a weak pointer to this object.
   virtual base::WeakPtr<ProvidedFileSystemInterface> GetWeakPtr() = 0;
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_