ForwardingAudioSink: add override for release()

We forgot to add it when we added AudioSink.release(). The commit
includes a test that ensures ForwardingAudioSink overrides all the
methods defined in the AudioSink interface.

PiperOrigin-RevId: 609402258

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/audio/ForwardingAudioSink.java

@@ -203,4 +203,9 @@ public class ForwardingAudioSink implements AudioSink {
   public void reset() {
     sink.reset();
   }
+
+  @Override
+  public void release() {
+    sink.release();
+  }
 }

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/audio/ForwardingAudioSinkTest.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package androidx.media3.exoplayer.audio;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import androidx.media3.test.utils.TestUtil;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import java.lang.reflect.Method;
+import java.util.List;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/** Unit tests for {@link ForwardingAudioSink}. */
+@RunWith(AndroidJUnit4.class)
+public final class ForwardingAudioSinkTest {
+  @Test
+  public void forwardingAudioSink_overridesAllAudioSinkMethods() throws NoSuchMethodException {
+    // Check with reflection that ForwardingAudioSink overrides all AudioSink methods.
+    List<Method> methods = TestUtil.getPublicMethods(AudioSink.class);
+    for (Method method : methods) {
+      assertThat(
+              ForwardingAudioSink.class
+                  .getDeclaredMethod(method.getName(), method.getParameterTypes())
+                  .getDeclaringClass())
+          .isEqualTo(ForwardingAudioSink.class);
+    }
+  }
+}