Whitelist TimeScapes to access restricted native local filesystem.

chrome/browser/chromeos/fileapi/file_system_backend.cc

Index: chrome/browser/chromeos/fileapi/file_system_backend.cc
diff --git a/chrome/browser/chromeos/fileapi/file_system_backend.cc b/chrome/browser/chromeos/fileapi/file_system_backend.cc
index f25daa0822bbca76b43c55c6ce4e8508d3339bef..43a62c1f0c7019a2b62d3c84c445059d65aac452 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend.cc
+++ b/chrome/browser/chromeos/fileapi/file_system_backend.cc
@@ -142,6 +142,13 @@ bool FileSystemBackend::IsAccessAllowed(
     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;