Rename "CheckWritable" to "PrepareForWritableApp" to reflect the actual behavior.

chrome/browser/extensions/api/file_handlers/app_file_handler_util.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_HANDLERS_APP_FILE_HANDLER_UTIL_H_
 #define CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_APP_FILE_HANDLER_UTIL_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 48 matching lines @@
 
 // Creates a new file entry and allows |renderer_id| to access |path|. This
 // registers a new file system for |path|.
 apps::file_handler_util::GrantedFileEntry CreateFileEntry(
     Profile* profile,
     const Extension* extension,
     int renderer_id,
     const base::FilePath& path,
     bool is_directory);
 
-void CheckWritableFiles(
+// When |is_directory| is true, it verifies that directories exist at each of
+// the |paths| and calls back to |on_success| or otherwise to |on_failure|.
+// When |is_directory| is false, it ensures regular files exists (not links and
+// directories) at the |paths|, creating files if needed, and calls back to
+// |on_success| or to |on_failure| depending on the result.
+void PrepareFilesForWritableApp(
     const std::vector<base::FilePath>& paths,
     Profile* profile,
     bool is_directory,
     const base::Closure& on_success,
     const base::Callback<void(const base::FilePath&)>& on_failure);
 
 // Returns whether |extension| has the fileSystem.write permission.
 bool HasFileSystemWritePermission(const Extension* extension);
 
 // Validates a file entry and populates |file_path| with the absolute path if it
 // is valid.
 bool ValidateFileEntryAndGetPath(
     const std::string& filesystem_name,
     const std::string& filesystem_path,
     const content::RenderViewHost* render_view_host,
     base::FilePath* file_path,
     std::string* error);
 
 }  // namespace app_file_handler_util
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_FILE_HANDLERS_APP_FILE_HANDLER_UTIL_H_