Fix ad progress updates after rebuffering an ad

Issue: #8239

PiperOrigin-RevId: 344211877

RELEASENOTES.md

@@ -45,6 +45,9 @@
         ([#7832](https://github.com/google/ExoPlayer/issues/7832)).
     *   Fix a bug that caused multiple ads in an ad pod to be skipped when one
         ad in the ad pod was skipped.
+    *   Fix a bug that caused ad progress not to be updated if the player
+        resumed after buffering during an ad
+        ([#8239](https://github.com/google/ExoPlayer/issues/8239)).
     *   Fix passing an ads response to the `ImaAdsLoader` builder.
     *   Set the overlay language based on the device locale by default.
 *   Cronet extension:

extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java

@@ -1243,6 +1243,7 @@ public final class ImaAdsLoader
   private void handlePlayerStateChanged(boolean playWhenReady, @Player.State int playbackState) {
     if (playingAd && imaAdState == IMA_AD_STATE_PLAYING) {
       if (!bufferingAd && playbackState == Player.STATE_BUFFERING) {
+        bufferingAd = true;
         AdMediaInfo adMediaInfo = checkNotNull(imaAdMediaInfo);
         for (int i = 0; i < adCallbacks.size(); i++) {
           adCallbacks.get(i).onBuffering(adMediaInfo);