Cleanup: Add fileapi::GetIsolatedFileSystemRootURIString

webkit/fileapi/file_system_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 WEBKIT_FILEAPI_FILE_SYSTEM_UTIL_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 105 matching lines @@
     const std::string& filesystem_id);
 
 // Find the file system id from |filesystem_name|. Should only be used by
 // platform apps. This function will return false if the file system name is
 // not of the form {origin}:Isolated_{id}, and will also check that there is an
 // origin and id present. It will not check that the origin or id are valid.
 WEBKIT_STORAGE_EXPORT bool CrackIsolatedFileSystemName(
     const std::string& filesystem_name,
     std::string* filesystem_id);
 
+// Returns the root URI for an isolated filesystem for origin |origin_url|
+// and |filesystem_id|. If the |optional_root_name| is given the resulting
+// root URI will point to the subfolder within the isolated filesystem.
+WEBKIT_STORAGE_EXPORT std::string GetIsolatedFileSystemRootURIString(
+    const GURL& origin_url,
+    const std::string& filesystem_id,
+    const std::string& optional_root_name);
+
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_UTIL_H_