Cleanup: Add fileapi::GetIsolatedFileSystemRootURIString

webkit/fileapi/file_system_util.cc

 // 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.
 
 #include "webkit/fileapi/file_system_util.h"
 
 #include "build/build_config.h"
 
 #include "base/file_path.h"
 #include "base/logging.h"
@@ skipping 255 matching lines @@
     return false;
 
   *filesystem_id = filesystem_name.substr(pos + start_token.length(),
                                           std::string::npos);
   if (filesystem_id->empty())
     return false;
 
   return true;
 }
 
+std::string GetIsolatedFileSystemRootURIString(
+    const GURL& origin_url,
+    const std::string& filesystem_id,
+    const std::string& optional_root_name) {
+  std::string root = GetFileSystemRootURI(origin_url,
+                                          kFileSystemTypeIsolated).spec();
+  root.append(filesystem_id);
+  root.append("/");
+  if (!optional_root_name.empty()) {
+    DCHECK(!FilePath::FromUTF8Unsafe(optional_root_name).ReferencesParent());
+    root.append(optional_root_name);
+    root.append("/");
+  }
+  return root;
+}
+
 }  // namespace fileapi