Merge pull request googleads#310 from shawnbuso/playlist_fix

Fixed issue googleads#300.

examples/playlist/ads.js

@@ -35,7 +35,7 @@ var Ads = function() {
       navigator.userAgent.match(/Android/i)) {
     startEvent = 'touchend';
   }
-  this.player.one(startEvent, this.bind(this, this.init));
+  this.player.one(startEvent, this.bind(this, this.initFromStart));
 
   this.options = {
     id: 'content_video',
@@ -85,12 +85,22 @@ var Ads = function() {
 
 }
 
+Ads.prototype.initFromStart = function() {
+  if (!this.initialized) {
+    this.init();
+    this.requestAdsAndPlay();
+  }
+}
+
 Ads.prototype.init = function() {
   this.initialized = true;
   this.player.ima.initializeAdDisplayContainer();
+};
+
+Ads.prototype.requestAdsAndPlay = function() {
   this.player.ima.requestAds();
   this.player.play();
-};
+}
 
 Ads.prototype.adsManagerLoadedCallback = function() {
   for (var index = 0; index < this.events.length; index++) {
@@ -113,6 +123,9 @@ Ads.prototype.onAdEvent = function(event) {
 };
 
 Ads.prototype.onPlaylistItemClick = function(event) {
+  if (!this.initialized) {
+    this.init();
+  }
   if (!this.linearAdPlaying) {
     this.player.ima.setContentWithAdTag(
         this.contents[event.target.id],