[fsp] Add support for reading directories.

chrome/browser/chromeos/file_system_provider/fake_provided_file_system.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_FAKE_PROVIDED_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FAKE_PROVIDED_FILE_SYSTEM_H_
 
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
 
@@ skipping 13 matching lines @@
   explicit FakeProvidedFileSystem(
       const ProvidedFileSystemInfo& file_system_info);
   virtual ~FakeProvidedFileSystem();
 
   // ProvidedFileSystemInterface overrides.
   virtual void RequestUnmount(
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
   virtual void GetMetadata(
       const base::FilePath& entry_path,
       const fileapi::AsyncFileUtil::GetFileInfoCallback& callback) OVERRIDE;
+  virtual void ReadDirectory(
+      const base::FilePath& directory_path,
+      const fileapi::AsyncFileUtil::ReadDirectoryCallback& callback) OVERRIDE;
   virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const OVERRIDE;
   virtual RequestManager* GetRequestManager() OVERRIDE;
 
   // Factory callback, to be used in Service::SetFileSystemFactory(). The
   // |event_router| argument can be NULL.
   static ProvidedFileSystemInterface* Create(
       extensions::EventRouter* event_router,
       const ProvidedFileSystemInfo& file_system_info);
 
  private:
   ProvidedFileSystemInfo file_system_info_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeProvidedFileSystem);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_FAKE_PROVIDED_FILE_SYSTEM_H_