Restrict the visibility of some `DefaultDrmSession` methods

These are only used from within the package, so demote them from public
to package-private.

PiperOrigin-RevId: 515029018

RELEASENOTES.md

@@ -16,6 +16,14 @@
         `AudioProcessors` are active, e.g. for gapless trimming
         `AudioProcessors` are active, e.g. for gapless trimming
         ([#10847](https://github.com/google/ExoPlayer/issues/10847)).
         ([#10847](https://github.com/google/ExoPlayer/issues/10847)).
     *   Encapsulate Opus frames in Ogg packets in direct playbacks (offload).
     *   Encapsulate Opus frames in Ogg packets in direct playbacks (offload).
+*   DRM:
+    *   Reduce the visibility of several internal-only methods on
+        `DefaultDrmSession` that aren't expected to be called from outside the
+        DRM package:
+        *   `void onMediaDrmEvent(int)`
+        *   `void provision()`
+        *   `void onProvisionCompleted()`
+        *   `onProvisionError(Exception, boolean)`
 *   Transformer:
 *   Transformer:
     *   Remove `Transformer.Builder.setMediaSourceFactory(MediaSource.Factory)`.
     *   Remove `Transformer.Builder.setMediaSourceFactory(MediaSource.Factory)`.
         Use `ExoPlayerAssetLoader.Factory(MediaSource.Factory)` and
         Use `ExoPlayerAssetLoader.Factory(MediaSource.Factory)` and

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

@@ -216,7 +216,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     return Arrays.equals(this.sessionId, sessionId);
     return Arrays.equals(this.sessionId, sessionId);
   }
   }
 
 
-  public void onMediaDrmEvent(int what) {
+  /* package */ void onMediaDrmEvent(int what) {
     switch (what) {
     switch (what) {
       case ExoMediaDrm.EVENT_KEY_REQUIRED:
       case ExoMediaDrm.EVENT_KEY_REQUIRED:
         onKeysRequired();
         onKeysRequired();
@@ -228,7 +228,7 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
 
   // Provisioning implementation.
   // Provisioning implementation.
 
 
-  public void provision() {
+  /* package */ void provision() {
     currentProvisionRequest = mediaDrm.getProvisionRequest();
     currentProvisionRequest = mediaDrm.getProvisionRequest();
     Util.castNonNull(requestHandler)
     Util.castNonNull(requestHandler)
         .post(
         .post(
@@ -237,13 +237,13 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
             /* allowRetry= */ true);
             /* allowRetry= */ true);
   }
   }
 
 
-  public void onProvisionCompleted() {
+  /* package */ void onProvisionCompleted() {
     if (openInternal()) {
     if (openInternal()) {
       doLicense(true);
       doLicense(true);
     }
     }
   }
   }
 
 
-  public void onProvisionError(Exception error, boolean thrownByExoMediaDrm) {
+  /* package */ void onProvisionError(Exception error, boolean thrownByExoMediaDrm) {
     onError(
     onError(
         error,
         error,
         thrownByExoMediaDrm
         thrownByExoMediaDrm