Add missing Nullable annotation Player.EventListener.onTimelineChanged

Issue: #4593

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=206911927

demos/cast/src/main/java/com/google/android/exoplayer2/castdemo/PlayerManager.java

@@ -17,6 +17,7 @@ package com.google.android.exoplayer2.castdemo;
 
 import android.content.Context;
 import android.net.Uri;
+import android.support.annotation.Nullable;
 import android.view.KeyEvent;
 import android.view.View;
 import com.google.android.exoplayer2.C;
@@ -276,7 +277,7 @@ import java.util.ArrayList;
 
   @Override
   public void onTimelineChanged(
-      Timeline timeline, Object manifest, @TimelineChangeReason int reason) {
+      Timeline timeline, @Nullable Object manifest, @TimelineChangeReason int reason) {
     updateCurrentItemIndex();
     if (timeline.isEmpty()) {
       castMediaQueueCreationPending = true;

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

@@ -837,8 +837,8 @@ public final class ImaAdsLoader
   // Player.EventListener implementation.
 
   @Override
-  public void onTimelineChanged(Timeline timeline, Object manifest,
-      @Player.TimelineChangeReason int reason) {
+  public void onTimelineChanged(
+      Timeline timeline, @Nullable Object manifest, @Player.TimelineChangeReason int reason) {
     if (reason == Player.TIMELINE_CHANGE_REASON_RESET) {
       // The player is being reset and this source will be released.
       return;

extensions/leanback/src/main/java/com/google/android/exoplayer2/ext/leanback/LeanbackPlayerAdapter.java

@@ -288,8 +288,8 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter implements Runnab
     }
 
     @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest,
-        @TimelineChangeReason int reason) {
+    public void onTimelineChanged(
+        Timeline timeline, @Nullable Object manifest, @TimelineChangeReason int reason) {
       Callback callback = getCallback();
       callback.onDurationChanged(LeanbackPlayerAdapter.this);
       callback.onCurrentPositionChanged(LeanbackPlayerAdapter.this);

extensions/mediasession/src/main/java/com/google/android/exoplayer2/ext/mediasession/MediaSessionConnector.java

@@ -774,7 +774,7 @@ public final class MediaSessionConnector {
 
     @Override
     public void onTimelineChanged(
-        Timeline timeline, Object manifest, @Player.TimelineChangeReason int reason) {
+        Timeline timeline, @Nullable Object manifest, @Player.TimelineChangeReason int reason) {
       int windowCount = player.getCurrentTimeline().getWindowCount();
       int windowIndex = player.getCurrentWindowIndex();
       if (queueNavigator != null) {

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

@@ -248,7 +248,7 @@ public interface Player {
      * @param reason The {@link TimelineChangeReason} responsible for this timeline change.
      */
     default void onTimelineChanged(
-        Timeline timeline, Object manifest, @TimelineChangeReason int reason) {}
+        Timeline timeline, @Nullable Object manifest, @TimelineChangeReason int reason) {}
 
     /**
      * Called when the available or selected tracks change.
@@ -340,15 +340,15 @@ public interface Player {
   abstract class DefaultEventListener implements EventListener {
 
     @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest,
-        @TimelineChangeReason int reason) {
+    public void onTimelineChanged(
+        Timeline timeline, @Nullable Object manifest, @TimelineChangeReason int reason) {
       // Call deprecated version. Otherwise, do nothing.
       onTimelineChanged(timeline, manifest);
     }
 
     /** @deprecated Use {@link EventListener#onTimelineChanged(Timeline, Object, int)} instead. */
     @Deprecated
-    public void onTimelineChanged(Timeline timeline, Object manifest) {
+    public void onTimelineChanged(Timeline timeline, @Nullable Object manifest) {
       // Do nothing.
     }
   }

library/core/src/main/java/com/google/android/exoplayer2/analytics/AnalyticsCollector.java

@@ -432,7 +432,7 @@ public class AnalyticsCollector
 
   @Override
   public final void onTimelineChanged(
-      Timeline timeline, Object manifest, @Player.TimelineChangeReason int reason) {
+      Timeline timeline, @Nullable Object manifest, @Player.TimelineChangeReason int reason) {
     mediaPeriodQueueTracker.onTimelineChanged(timeline);
     EventTime eventTime = generatePlayingMediaPeriodEventTime();
     for (AnalyticsListener listener : listeners) {

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

@@ -2186,7 +2186,7 @@ public final class ExoPlayerTest {
     final EventListener eventListener =
         new EventListener() {
           @Override
-          public void onTimelineChanged(Timeline timeline, Object manifest, int reason) {
+          public void onTimelineChanged(Timeline timeline, @Nullable Object manifest, int reason) {
             if (timeline.isEmpty()) {
               playerReference.get().setPlayWhenReady(/* playWhenReady= */ false);
             }

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerControlView.java

@@ -1090,7 +1090,7 @@ public class PlayerControlView extends FrameLayout {
 
     @Override
     public void onTimelineChanged(
-        Timeline timeline, Object manifest, @Player.TimelineChangeReason int reason) {
+        Timeline timeline, @Nullable Object manifest, @Player.TimelineChangeReason int reason) {
       updateNavigation();
       updateTimeBarMode();
       updateProgress();

library/ui/src/main/java/com/google/android/exoplayer2/ui/PlayerNotificationManager.java

@@ -953,7 +953,7 @@ public class PlayerNotificationManager {
     }
 
     @Override
-    public void onTimelineChanged(Timeline timeline, Object manifest, int reason) {
+    public void onTimelineChanged(Timeline timeline, @Nullable Object manifest, int reason) {
       if (player == null || player.getPlaybackState() == Player.STATE_IDLE) {
         return;
       }

testutils/src/main/java/com/google/android/exoplayer2/testutil/Action.java

@@ -575,7 +575,9 @@ public abstract class Action {
           new Player.EventListener() {
             @Override
             public void onTimelineChanged(
-                Timeline timeline, Object manifest, @Player.TimelineChangeReason int reason) {
+                Timeline timeline,
+                @Nullable Object manifest,
+                @Player.TimelineChangeReason int reason) {
               if (expectedTimeline == null || timeline.equals(expectedTimeline)) {
                 player.removeListener(this);
                 nextAction.schedule(player, trackSelector, surface, handler);

testutils/src/main/java/com/google/android/exoplayer2/testutil/ExoPlayerTestRunner.java

@@ -608,8 +608,8 @@ public final class ExoPlayerTestRunner implements Player.EventListener, ActionSc
   // Player.EventListener
 
   @Override
-  public void onTimelineChanged(Timeline timeline, Object manifest,
-      @Player.TimelineChangeReason int reason) {
+  public void onTimelineChanged(
+      Timeline timeline, @Nullable Object manifest, @Player.TimelineChangeReason int reason) {
     timelines.add(timeline);
     manifests.add(manifest);
     timelineChangeReasons.add(reason);