added injectScript method

Former-commit-id: 189045f4268a8c12cbff28b6518abb4ecf867a1e

extension/index.js

@@ -46,5 +46,6 @@ this.singlefile.extension = this.singlefile.extension || {
 			bg: {}
 		},
 	},
+	injectScript: (tabId, options) => this.singlefile.extension.lib.core.bg.scripts.inject(tabId, options),
 	getPageData: (options, doc, win) => this.singlefile.lib.getPageData(options, { fetch: this.singlefile.extension.lib.fetch.content.resources.fetch }, doc, win)
 };