Whitelist TimeScapes to access restricted native local filesystem.

chrome/browser/chromeos/fileapi/file_system_backend.cc

 // Copyright 2013 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/chromeos/fileapi/file_system_backend.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 124 matching lines @@
     return true;
 
   // No extra check is needed for isolated file systems.
   if (url.mount_type() == fileapi::kFileSystemTypeIsolated)
     return true;
 
   if (!CanHandleURL(url))
     return false;
 
   std::string extension_id = origin_url.host();
+  // TODO(mtomasz): Temporarily whitelist TimeScapes. Remove this in M-31.
+  // See: crbug.com/271946
+  if (extension_id == "mppoamgbcpnkpacolchbacppkflagjbp" &&
+      url.type() == fileapi::kFileSystemTypeRestrictedNativeLocal) {
+    return true;
+  }
+
   // Check first to make sure this extension has fileBrowserHander permissions.
   if (!special_storage_policy_->IsFileHandler(extension_id))
     return false;
 
   return file_access_permissions_->HasAccessPermission(extension_id,
                                                        url.virtual_path());
 }
 
 void FileSystemBackend::GrantFullAccessToExtension(
     const std::string& extension_id) {
@@ skipping 158 matching lines @@
   std::string mount_name = url.filesystem_id();
   if (!mount_points_->GetRegisteredPath(mount_name, &root_path) &&
       !system_mount_points_->GetRegisteredPath(mount_name, &root_path)) {
     return base::FilePath();
   }
 
   return root_path.DirName();
 }
 
 }  // namespace chromeos