Make chrome.fileSystem.chooseEntry work on Google Drive directories.

chrome/browser/drive/fake_drive_service.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 "chrome/browser/drive/fake_drive_service.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/logging.h"
@@ skipping 763 matching lines @@
   // Go through entries and copy the one that matches |resource_id|.
   if (resource_list_value_->GetList("entry", &entries)) {
     for (size_t i = 0; i < entries->GetSize(); ++i) {
       base::DictionaryValue* entry = NULL;
       std::string current_resource_id;
       if (entries->GetDictionary(i, &entry) &&
           entry->GetString("gd$resourceId.$t", &current_resource_id) &&
           resource_id == current_resource_id) {
         // Make a copy and set the new resource ID and the new title.
         scoped_ptr<base::DictionaryValue> copied_entry(entry->DeepCopy());
-        copied_entry->SetString("gd$resourceId.$t",
-                                resource_id + "_copied");
+        copied_entry->SetString("gd$resourceId.$t", GetNewResourceId());
         copied_entry->SetString("title.$t", new_title);
 
         // Reset parent directory.
         base::ListValue* links = NULL;
         if (!copied_entry->GetList("link", &links)) {
           links = new base::ListValue;
           copied_entry->Set("link", links);
         }
         links->Clear();
 
@@ skipping 937 matching lines @@
       FROM_HERE,
       base::Bind(callback, HTTP_SUCCESS, base::Passed(&resource_list)));
 }
 
 GURL FakeDriveService::GetNewUploadSessionUrl() {
   return GURL("https://upload_session_url/" +
               base::Int64ToString(next_upload_sequence_number_++));
 }
 
 }  // namespace drive