wpe: add possibility to run javascript on loaded page
In order to control what gets rendered in the wpesrc we need to run a javascript on the loaded page. This is possible using wpe-webkit, but it is not exposed in the wpevideosrc.
In order to control what gets rendered in the wpesrc we need to run a javascript on the loaded page. This is possible using wpe-webkit, but it is not exposed in the wpevideosrc.