Add support for directory access to the file system API.

chrome/browser/extensions/api/file_system/file_system_api.h

 // Copyright (c) 2012 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_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/common/extensions/api/file_system.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
@@ skipping 56 matching lines @@
   // Adds an entry to the response dictionary.
   void AddEntryToResponse(const base::FilePath& path,
                           const std::string& id_override);
 
   // called on the UI thread if there is a problem checking a writable file.
   void HandleWritableFileError(const base::FilePath& error_path);
 
   // Whether multiple entries have been requested.
   bool multiple_;
 
+  // Whether a directory has been requested.
+  bool is_directory_;
+
   // The dictionary to send as the response.
   base::DictionaryValue* response_;
 };
 
 class FileSystemGetWritableEntryFunction : public FileSystemEntryFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileSystem.getWritableEntry",
                              FILESYSTEM_GETWRITABLEENTRY)
 
  protected:
   virtual ~FileSystemGetWritableEntryFunction() {}
   virtual bool RunImpl() OVERRIDE;
+
+ private:
+  void CheckPermissionAndSendResponse();
+  void SetIsDirectoryOnFileThread();
+
+  // The path to the file for which a writable entry has been requested.
+  base::FilePath path_;
 };
 
 class FileSystemIsWritableEntryFunction : public SyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileSystem.isWritableEntry",
                              FILESYSTEM_ISWRITABLEENTRY)
 
  protected:
   virtual ~FileSystemIsWritableEntryFunction() {}
   virtual bool RunImpl() OVERRIDE;
@@ skipping 40 matching lines @@
   void SetInitialPathOnFileThread(const base::FilePath& suggested_name,
                                   const base::FilePath& previous_path);
 
   // FilesSelected and FileSelectionCanceled are called by the file picker.
   void FilesSelected(const std::vector<base::FilePath>& path);
   void FileSelectionCanceled();
 
   base::FilePath initial_path_;
 };
 
-class FileSystemRetainEntryFunction : public SyncExtensionFunction {
+class FileSystemRetainEntryFunction : public AsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileSystem.retainEntry", FILESYSTEM_RETAINENTRY)
 
  protected:
   virtual ~FileSystemRetainEntryFunction() {}
   virtual bool RunImpl() OVERRIDE;
 
  private:
   // Retains the file entry referenced by |entry_id| in apps::SavedFilesService.
   // |entry_id| must refer to an entry in an isolated file system.
-  bool RetainFileEntry(const std::string& entry_id);
+  void RetainFileEntry(const std::string& entry_id);
+
+  void SetIsDirectoryOnFileThread();
+
+  // Whether the file being retained is a directory.
+  bool is_directory_;
+
+  // The path to the file to retain.
+  base::FilePath path_;
 };
 
 class FileSystemIsRestorableFunction : public SyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileSystem.isRestorable", FILESYSTEM_ISRESTORABLE)
 
  protected:
   virtual ~FileSystemIsRestorableFunction() {}
   virtual bool RunImpl() OVERRIDE;
 };
 
 class FileSystemRestoreEntryFunction : public FileSystemEntryFunction {
  public:
   DECLARE_EXTENSION_FUNCTION("fileSystem.restoreEntry", FILESYSTEM_RESTOREENTRY)
 
  protected:
   virtual ~FileSystemRestoreEntryFunction() {}
   virtual bool RunImpl() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_