Do not start rebuffering after playback ended.

This is currently happening after toggling the repeat mode. This is line with
the rest of the implementation which requires a seek operation to resume
playback.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=160516449

library/core/src/androidTest/java/com/google/android/exoplayer2/ExoPlayerTest.java

@@ -226,22 +226,22 @@ public final class ExoPlayerTest extends TestCase {
     final int[] actionSchedule = { // 0 -> 1
         ExoPlayer.REPEAT_MODE_ONE, // 1 -> 1
         ExoPlayer.REPEAT_MODE_OFF, // 1 -> 2
-        -1, // 2 -> ended
+        ExoPlayer.REPEAT_MODE_ONE, // 2 -> 2
-        ExoPlayer.REPEAT_MODE_ONE, // ended -> 2
         ExoPlayer.REPEAT_MODE_ALL, // 2 -> 0
         ExoPlayer.REPEAT_MODE_ONE, // 0 -> 0
         -1, // 0 -> 0
         ExoPlayer.REPEAT_MODE_OFF, // 0 -> 1
         -1, // 1 -> 2
-        -1, // 2 -> ended
+        -1  // 2 -> ended
-        -1
     };
-    int[] expectedWindowIndices = {1, 1, 2, 2, 2, 0, 0, 0, 1, 2, 2};
+    int[] expectedWindowIndices = {1, 1, 2, 2, 0, 0, 0, 1, 2};
     final LinkedList<Integer> windowIndices = new LinkedList<>();
     final CountDownLatch actionCounter = new CountDownLatch(actionSchedule.length);
     PlayerWrapper playerWrapper = new PlayerWrapper() {
+      @Override
       @SuppressWarnings("ResourceType")
-      private void executeAction() {
+      public void onPositionDiscontinuity() {
+        super.onPositionDiscontinuity();
         int actionIndex = actionSchedule.length - (int) actionCounter.getCount();
         if (actionSchedule[actionIndex] != -1) {
           player.setRepeatMode(actionSchedule[actionIndex]);
@@ -249,20 +249,6 @@ public final class ExoPlayerTest extends TestCase {
         windowIndices.add(player.getCurrentWindowIndex());
         actionCounter.countDown();
       }
-
-      @Override
-      public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
-        super.onPlayerStateChanged(playWhenReady, playbackState);
-        if (playbackState == ExoPlayer.STATE_ENDED) {
-          executeAction();
-        }
-      }
-
-      @Override
-      public void onPositionDiscontinuity() {
-        super.onPositionDiscontinuity();
-        executeAction();
-      }
     };
     MediaSource mediaSource = new FakeMediaSource(timeline, null, TEST_VIDEO_FORMAT);
     FakeRenderer renderer = new FakeRenderer(TEST_VIDEO_FORMAT);

library/core/src/main/java/com/google/android/exoplayer2/ExoPlayerImplInternal.java

@@ -488,11 +488,6 @@ import java.io.IOException;
       long newPositionUs = seekToPeriodPosition(periodId, playbackInfo.positionUs);
       playbackInfo = new PlaybackInfo(periodId, newPositionUs);
     }
-
-    // Restart buffering if playback has ended and repetition is enabled.
-    if (state == ExoPlayer.STATE_ENDED && repeatMode != ExoPlayer.REPEAT_MODE_OFF) {
-      setState(ExoPlayer.STATE_BUFFERING);
-    }
   }
 
   private void startRenderers() throws ExoPlaybackException {