Add ExoPlayer.isScrubbingModeEnabled

This helps integration with `PlayerControlView` in a follow-up change,
where we need to reliably know if scrubbing mode is still enabled (in
case someone else disables it after we enable it).

PiperOrigin-RevId: 750913644

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayer.java

@@ -1485,6 +1485,14 @@ public interface ExoPlayer extends Player {
   @UnstableApi
   void setScrubbingModeEnabled(boolean scrubbingModeEnabled);
 
+  /**
+   * Returns whether the player is optimized for scrubbing (many frequent seeks).
+   *
+   * <p>See {@link #setScrubbingModeEnabled(boolean)}.
+   */
+  @UnstableApi
+  boolean isScrubbingModeEnabled();
+
   /**
    * Sets the parameters that control behavior in {@linkplain #setScrubbingModeEnabled scrubbing
    * mode}.

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayerImpl.java

@@ -1611,6 +1611,12 @@ import java.util.concurrent.CopyOnWriteArraySet;
     maybeUpdatePlaybackSuppressionReason();
   }
 
+  @Override
+  public boolean isScrubbingModeEnabled() {
+    verifyApplicationThread();
+    return scrubbingModeEnabled;
+  }
+
   @Override
   public void setScrubbingModeParameters(ScrubbingModeParameters scrubbingModeParameters) {
     verifyApplicationThread();

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/SimpleExoPlayer.java

@@ -628,6 +628,12 @@ public class SimpleExoPlayer extends BasePlayer implements ExoPlayer {
     player.setScrubbingModeEnabled(scrubbingModeEnabled);
   }
 
+  @Override
+  public boolean isScrubbingModeEnabled() {
+    blockUntilConstructorFinished();
+    return player.isScrubbingModeEnabled();
+  }
+
   @Override
   public void setScrubbingModeParameters(ScrubbingModeParameters scrubbingModeParameters) {
     blockUntilConstructorFinished();

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/ExoPlayerScrubbingTest.java

@@ -63,6 +63,21 @@ import org.mockito.InOrder;
 @RunWith(AndroidJUnit4.class)
 public final class ExoPlayerScrubbingTest {
 
+  @Test
+  public void scrubbingMode_getterWorks() throws Exception {
+    ExoPlayer player =
+        new TestExoPlayerBuilder(ApplicationProvider.getApplicationContext()).build();
+    player.setMediaSource(new FakeMediaSource());
+    player.prepare();
+
+    assertThat(player.isScrubbingModeEnabled()).isFalse();
+    player.setScrubbingModeEnabled(true);
+    assertThat(player.isScrubbingModeEnabled()).isTrue();
+    player.setScrubbingModeEnabled(false);
+    assertThat(player.isScrubbingModeEnabled()).isFalse();
+    player.release();
+  }
+
   @Test
   public void scrubbingMode_suppressesPlayback() throws Exception {
     ExoPlayer player =

libraries/test_utils/src/main/java/androidx/media3/test/utils/StubExoPlayer.java

@@ -221,6 +221,11 @@ public class StubExoPlayer extends StubPlayer implements ExoPlayer {
     throw new UnsupportedOperationException();
   }
 
+  @Override
+  public boolean isScrubbingModeEnabled() {
+    throw new UnsupportedOperationException();
+  }
+
   @Override
   public void setScrubbingModeParameters(ScrubbingModeParameters scrubbingModeParameters) {
     throw new UnsupportedOperationException();