send.js

alert("hello");
function getStyle(oElm, strCssRule){
  var strValue = "";
  if(document.defaultView && document.defaultView.getComputedStyle){
      strValue = document.defaultView.getComputedStyle(oElm, "").getPropertyValue(strCssRule);
  }
  else if(oElm.currentStyle){
      strCssRule = strCssRule.replace(/\-(\w)/g, function (strMatch, p1){
          return p1.toUpperCase();
      });
      strValue = oElm.currentStyle[strCssRule];
  }
  return strValue;
}

function GetObjectinhtml() {
  var html = '';
  var all = document.getElementsByTagName("*");

  for (var i=0, max=all.length; i < max; i++) {
      // check html object
      if(all[i].localName == "button" || (all[i].localName == "input" && all[i].type != "hidden") || all[i].localName == "textarea" || (all[i].localName == "a" && all[i].href != "")) {
      var elemRect = all[i].getBoundingClientRect();
       html += all[i].outerHTML+ "\n\nwidth : " + all[i].offsetWidth + " height : " + getStyle(all[i], "height") + " left : " + elemRect.left + " top : " + elemRect.top + "\n\n";
      }
  }
  return html;
}

function sendNativeMessage(text) {
  message = {"text": text};
  port.postMessage(message);
  alert("Sent message: <b>" + JSON.stringify(message) + "</b>");
}

function onNativeMessage(message) {
  alert("Received message: <b>" + JSON.stringify(message) + "</b>");
}

function onDisconnected() {
  alert("Failed to connect: " + chrome.runtime.lastError.message);
  port = null;
}

function connect() {
  var hostName = "neuralactiontest";
  alert("Connecting to native messaging host <b>" + hostName + "</b>");
  port = chrome.runtime.connectNative(hostName);
  port.onMessage.addListener(onNativeMessage);
  port.onDisconnect.addListener(onDisconnected);
}

    connect();
    sendNativeMessage(GetObjectinhtml());