title: Inject a JavaScript API on everypage loaded on WebView
body: <p>I am coding a offline Scorm player, so need to inject an JavaScript API on every html page loaded by the WebView instance.
  I tried to use a frame-set approach, but WebView doesnt behave the way it should (besides that, its deprecated in HTML5). 
  How can I achieve this? I need the script to be injected before the page loads, because those html pages will consume the API on the body onLoad event..</p>
  
  <p>When trying to to override the 'onPageStarted' WebViewClient method, although the event was fired, the JS code injected could not be reached.</p>
  
  <p>Thanks in advance,
                  Pablo</p>