Allow script to request durable storage permission (chrome side)

content/public/test/mock_special_storage_policy.cc

 // Copyright 2014 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 "content/public/test/mock_special_storage_policy.h"
 
 #include "base/stl_util.h"
 
 namespace content {
 
@@ skipping 20 matching lines @@
 }
 
 bool MockSpecialStoragePolicy::HasIsolatedStorage(const GURL& origin) {
   return ContainsKey(isolated_, origin);
 }
 
 bool MockSpecialStoragePolicy::HasSessionOnlyOrigins() {
   return !session_only_.empty();
 }
 
+bool MockSpecialStoragePolicy::IsStorageDurable(const GURL& origin) {
+  return false;
+}
+
 MockSpecialStoragePolicy::~MockSpecialStoragePolicy() {}
 
 }  // namespace content