Add new APIs to ExoMediaDrm

Changes
---
- Added `removeOfflineLicense(byte[])` and `getOfflineLicenseKeySetIds` and consumed them in their implementations

Background
---
- These APIs will help in addressing an increasing amount of `java.lang.IllegalArgumentException: Failed to restore keys: BAD_VALUE` which is our top playback error in our app
	- Based on our discussion with Widevine team and [this exoplayer issue](https://github.com/google/ExoPlayer/issues/11202#issuecomment-1708792594)
		- TL;DR: The failure occurs on startup if the user has 200+ offline licenses, we would like to add the functionality to remove offline licenses

**Note: Why we want these APIs in ExoMediaDrm and not in OfflineLicenseHelper**
	- As per the issue above, we would like to access these 2 public APIs in MediaDrm that don’t exist in `OfflineLicenseHelper` or `ExoMediaDrm`
		- APIs interested in:
			- [MediaDrm#removeOfflineLicense()](https://developer.android.com/reference/android/media/MediaDrm#removeOfflineLicense(byte%5B%5D)): To remove offline license
			- [MediaDrm#getOfflineLicenseKeySetIds()](https://developer.android.com/reference/android/media/MediaDrm#getOfflineLicenseKeySetIds()): To see number of offline licenses on startup

		- We use `OfflineLicenseHelper` to download license for L1 and we don't interact with `ExoMediaDrm` directly. But for the alternate Widevine integration, we directly depend on `ExoMediaDrm` APIs to override and call CDM Native APIs.
		- We would like to have the functionality of removing offline licenses for both integration which would need access to above APIs in `ExoMediaDrm`.

Links
---
- https://github.com/androidx/media/issues/659

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/drm/DummyExoMediaDrm.java

@@ -24,6 +24,7 @@ import androidx.media3.common.DrmInitData;
 import androidx.media3.common.util.UnstableApi;
 import androidx.media3.common.util.Util;
 import androidx.media3.decoder.CryptoConfig;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -156,4 +157,15 @@ public final class DummyExoMediaDrm implements ExoMediaDrm {
   public @C.CryptoType int getCryptoType() {
     return C.CRYPTO_TYPE_UNSUPPORTED;
   }
+
+  @Override
+  public void removeOfflineLicense(byte[] keySetId) {
+    // Should not be invoked. No session should exist.
+    throw new IllegalStateException();
+  }
+
+  @Override
+  public List<byte[]> getOfflineLicenseKeySetIds() {
+    return Collections.emptyList();
+  }
 }

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/drm/ExoMediaDrm.java

@@ -583,4 +583,19 @@ public interface ExoMediaDrm {
    */
   @C.CryptoType
   int getCryptoType();
+
+  /**
+   * Removes an offline license.
+   * This method is generally not needed, and should only be used if the preferred approach of passing {@link MediaDrm#KEY_TYPE_RELEASE} to {@link #getKeyRequest} is not possible.
+   *
+   * See {@link MediaDrm#removeOfflineLicense(byte[])} for more details.
+   */
+  void removeOfflineLicense(byte[] keySetId);
+
+  /**
+   * This method returns a list of the keySetIds for all offline licenses.
+   *
+   * See {@link MediaDrm#getOfflineLicenseKeySetIds()} for more details.
+   */
+  List<byte[]> getOfflineLicenseKeySetIds();
 }

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/drm/FrameworkMediaDrm.java

@@ -26,6 +26,7 @@ import android.media.MediaDrmException;
 import android.media.NotProvisionedException;
 import android.media.UnsupportedSchemeException;
 import android.media.metrics.LogSessionId;
+import android.os.Build;
 import android.os.PersistableBundle;
 import android.text.TextUtils;
 import androidx.annotation.DoNotInline;
@@ -46,6 +47,7 @@ import com.google.common.base.Charsets;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -380,6 +382,26 @@ public final class FrameworkMediaDrm implements ExoMediaDrm {
     return C.CRYPTO_TYPE_FRAMEWORK;
   }
 
+  @Override
+  @RequiresApi(Build.VERSION_CODES.Q)
+  public void removeOfflineLicense(byte[] keySetId) {
+    if (Util.SDK_INT < Build.VERSION_CODES.Q) {
+      throw new UnsupportedOperationException();
+    }
+
+    mediaDrm.removeOfflineLicense(keySetId);
+  }
+
+  @Override
+  @RequiresApi(Build.VERSION_CODES.Q)
+  public List<byte[]> getOfflineLicenseKeySetIds() {
+    if (Util.SDK_INT < Build.VERSION_CODES.Q) {
+      return Collections.emptyList();
+    }
+
+    return mediaDrm.getOfflineLicenseKeySetIds();
+  }
+
   private static SchemeData getSchemeData(UUID uuid, List<SchemeData> schemeDatas) {
     if (!C.WIDEVINE_UUID.equals(uuid)) {
       // For non-Widevine CDMs always use the first scheme data.

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

@@ -43,6 +43,7 @@ import com.google.common.primitives.Bytes;
 import com.google.errorprone.annotations.CanIgnoreReturnValue;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -413,6 +414,16 @@ public final class FakeExoMediaDrm implements ExoMediaDrm {
     return FakeCryptoConfig.TYPE;
   }
 
+  @Override
+  public void removeOfflineLicense(byte[] keySetId) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public List<byte[]> getOfflineLicenseKeySetIds() {
+    return Collections.emptyList();
+  }
+
   // Methods to facilitate testing
 
   public int getReferenceCount() {