Added a optional heartbeat option so we can combat Chrome unstable ha…

…nging and keep using it to ensure we are on the bleeding edge

lib/index.js

@@ -20,7 +20,7 @@ module.exports = exports = function(options) {
     ignoreSSL:            true,
 
     contentTypes:         [].concat(options.contentTypes || []),
-
+    
     userAgent:            options.userAgent || null,
 
     cpu:                  null,

lib/page.js

@@ -212,6 +212,9 @@ module.exports = exports = function(options) {
     // setup handlers
     Network.requestWillBeSent((params) => {
 
+      // flash a heartbeat
+      if(options.heartbeat) options.heartbeat();
+
       if(VARS.started === null) {
 
         // start tracking when the page started
@@ -264,9 +267,9 @@ module.exports = exports = function(options) {
     // Disabled as we don't need it for now
     Network.dataReceived(({requestId, dataLength}) => {
 
-        const entry = VARS.requests[requestId];
-        if (!entry) return;
-        entry.responseLength += dataLength;
+      const entry = VARS.requests[requestId];
+      if (!entry) return;
+      entry.responseLength += dataLength;
 
     });
 
@@ -453,6 +456,9 @@ module.exports = exports = function(options) {
 
     Network.responseReceived(function(params) {
 
+      // flash a heartbeat
+      if(options.heartbeat) options.heartbeat();
+
       // the resource
       var resource = VARS.requests[params.requestId];
 
@@ -882,6 +888,9 @@ module.exports = exports = function(options) {
     Promise.all(promises)
     .then(() => {
 
+      // flash a heartbeat
+      if(options.heartbeat) options.heartbeat();
+
       // options to navigate to
       var navigateOptions = {
 
@@ -952,6 +961,9 @@ module.exports = exports = function(options) {
 
     }).catch((err) => {
 
+      // flash a heartbeat
+      if(options.heartbeat) options.heartbeat();
+
       // output the error
       console.dir(err)