Add `Discourse-Track-View` header to XHR when transitioning

app/assets/javascripts/discourse/initializers/page-tracking.js.es6

@@ -5,7 +5,14 @@ export default {
   name: "page-tracking",
   after: 'register-discourse-location',
 
-  initialize: function() {
+  initialize: function(container) {
+
+    // Tell our AJAX system to track a page transition
+    var router = container.lookup('router:main');
+    router.on('willTransition', function() {
+      Discourse.viewTrackingRequired();
+    });
+
     var pageTracker = Discourse.PageTracker.current();
     pageTracker.start();
 
@@ -19,7 +26,6 @@ export default {
       return;
     }
 
-
     // Also use Universal Analytics if it is present
     if (typeof window.ga !== 'undefined') {
       pageTracker.on('change', function(url, title) {

app/assets/javascripts/discourse/mixins/ajax.js

@@ -7,8 +7,15 @@
   @namespace Discourse
   @module Discourse
 **/
+
+var _trackView = false;
+
 Discourse.Ajax = Em.Mixin.create({
 
+  viewTrackingRequired: function() {
+    _trackView = true;
+  },
+
   /**
     Our own $.ajax method. Makes sure the .then method executes in an Ember runloop
     for performance reasons. Also automatically adjusts the URL to support installs
@@ -42,6 +49,11 @@ Discourse.Ajax = Em.Mixin.create({
 
     var performAjax = function(resolve, reject) {
 
+      if (_trackView) {
+        _trackView = false;
+        args.headers = { 'Discourse-Track-View': true };
+      }
+
       args.success = function(xhr) {
         Ember.run(null, resolve, xhr);
       };

app/assets/javascripts/discourse/routes/discourse_route.js

@@ -26,6 +26,14 @@ Discourse.Route = Ember.Route.extend({
   },
 
   actions: {
+
+    // Ember doesn't provider a router `willTransition` event so let's make one
+    willTransition: function() {
+      var router = this.container.lookup('router:main');
+      Ember.run.once(router, router.trigger, 'willTransition');
+      return this._super();
+    },
+
     _collectTitleTokens: function(tokens) {
       // If there's a title token method, call it and get the token
       if (this.titleToken) {