fix(FEC-10469): pre-roll Ad for playlist displays for each second med…

…ia instead of for each one (#367)

Issue: No pre-roll Ad displays for second media.
Solution: Player should notify ad controller that media is ended as we do for ads with post-rolls, used promise implementation on playback ended.

src/common/controllers/ads-controller.js

@@ -322,19 +322,18 @@ class AdsController extends FakeEventTarget implements IAdsController {
     if (this._adIsLoading) {
       return;
     }
+    const bumperCtrl = this._adsPluginControllers.find(controller => this._isBumper(controller));
+    const adCtrl = this._adsPluginControllers.find(controller => !this._isBumper(controller));
+    const bumperCompletePromise = bumperCtrl && typeof bumperCtrl.onPlaybackEnded === 'function' ? bumperCtrl.onPlaybackEnded() : Promise.resolve();
+    const adCompletePromise = adCtrl && typeof adCtrl.onPlaybackEnded === 'function' ? adCtrl.onPlaybackEnded() : Promise.resolve();
     if (!(this._adBreaksLayout.includes(-1) || this._adBreaksLayout.includes('100%'))) {
       this._allAdsCompleted = true;
     } else {
-      const bumperCtrl = this._adsPluginControllers.find(controller => this._isBumper(controller));
-      const adCtrl = this._adsPluginControllers.find(controller => !this._isBumper(controller));
-      const bumperCompletePromise = bumperCtrl ? bumperCtrl.onPlaybackEnded() : Promise.resolve();
+      const playbackEndedHandler = () => this._handleConfiguredPostroll();
       // $FlowFixMe
       bumperCompletePromise.finally(() => {
-        adCtrl &&
-          // $FlowFixMe
-          adCtrl.onPlaybackEnded().finally(() => {
-            this._handleConfiguredPostroll();
-          });
+        // $FlowFixMe
+        adCompletePromise.finally(playbackEndedHandler);
       });
     }
   }