Fire event when scene is loaded

src/api/player.js

@@ -199,6 +199,7 @@ Player.prototype.onMessage_ = function(event) {
     case 'click':
     case 'ended':
     case 'getposition':
+    case 'loadedscene':
       this.emit(type, data);
       break;
     case 'volumechange':

src/embed/main.js

@@ -135,6 +135,11 @@ function onRenderLoad(event) {
 
     isReadySent = true;
   }
+
+  // Notify the scene has been loaded.
+  Util.sendParentMessage({
+    type: 'loadedscene'
+  });
 }
 
 function onPlayRequest() {