Make browse action available for dynamic/JS-driven tokenizers

Summary: Ref T5750. This makes browse work for all of the dynamic tokenizers in Herald, Policies, batch editor, etc.

Test Plan: Used tokenizers in Herald, Policies, Batch editor.

Reviewers: chad, btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5750

Differential Revision: https://secure.phabricator.com/D12442