Summary: This seems like a better approach than ad-hoc lookup in `electron.remove.argv`. Left a note to a task to provide a better interface to this. I also need this in order to ensure we're starting Flipper through the launcher which needs to happen before we start the Electron runtime. Reviewed By: jknoxville Differential Revision: D13881355 fbshipit-source-id: 69c70d71035a47084f789ddb4dc969b45ba4648b