Issue 4399 - Add WebView inheritor with ad blocking

libadblockplus-android/assets/inject.js

+var hideElements = function()
+{
+
+  // no need to invoke if already invoked on another event
+  if (jsBridge.isElementsHidden())
+  {
+    {{DEBUG}} console.log('already hidden, exiting');
+    return;
+  }
+
+  // hide using element visibility (to be replaced with script body)
+  {{HIDE}}
+
+  {{BRIDGE}}.setElementsHidden(true); // set flag not to do it again
+};
+
+if ({{BRIDGE}}.getAddDomListener() && document.readyState != 'complete')
+{
+  {{BRIDGE}}.setAddDomListener(false);
+
+  // onreadystatechange event
+  document.onreadystatechange = function()
+  {
+    {{DEBUG}} console.log('onreadystatechange() event fired (' + document.readyState + ')')
+    if (document.readyState == 'interactive')
+    {
+      hideElements();
+    }
+  }
+
+   // load event
+  window.addEventListener('load', function(event)
+  {
+    {{DEBUG}} console.log('load() event fired');
+    hideElements();
+  });
+
+  // DOMContentLoaded event
+  document.addEventListener('DOMContentLoaded', function()
+  {
+    {{DEBUG}} console.log('DOMContentLoaded() event fired');
+    hideElements();
+  }, false);
+
+};