No-op cleanup of DefaultDrmSessionManager

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=217139869

library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSession.java

@@ -209,23 +209,16 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
 
 
   @SuppressWarnings("deprecation")
   @SuppressWarnings("deprecation")
   public void onMediaDrmEvent(int what) {
   public void onMediaDrmEvent(int what) {
-    if (!isOpen()) {
-      return;
-    }
     switch (what) {
     switch (what) {
+      case ExoMediaDrm.EVENT_PROVISION_REQUIRED:
+        onProvisionRequired();
+        break;
       case ExoMediaDrm.EVENT_KEY_REQUIRED:
       case ExoMediaDrm.EVENT_KEY_REQUIRED:
-        doLicense(false);
+        onKeysRequired();
         break;
         break;
       case ExoMediaDrm.EVENT_KEY_EXPIRED:
       case ExoMediaDrm.EVENT_KEY_EXPIRED:
-        // When an already expired key is loaded MediaDrm sends this event immediately. Ignore
-        // this event if the state isn't STATE_OPENED_WITH_KEYS yet which means we're still
-        // waiting for key response.
         onKeysExpired();
         onKeysExpired();
         break;
         break;
-      case ExoMediaDrm.EVENT_PROVISION_REQUIRED:
-        state = STATE_OPENED;
-        provisioningManager.provisionRequired(this);
-        break;
       default:
       default:
         break;
         break;
     }
     }
@@ -441,8 +434,21 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
     }
     }
   }
   }
 
 
+  private void onProvisionRequired() {
+    if (mode == DefaultDrmSessionManager.MODE_PLAYBACK && isOpen()) {
+      state = STATE_OPENED;
+      provisioningManager.provisionRequired(this);
+    }
+  }
+
+  private void onKeysRequired() {
+    if (mode == DefaultDrmSessionManager.MODE_PLAYBACK && isOpen()) {
+      doLicense(/* allowRetry= */ false);
+    }
+  }
+
   private void onKeysExpired() {
   private void onKeysExpired() {
-    if (state == STATE_OPENED_WITH_KEYS) {
+    if (mode == DefaultDrmSessionManager.MODE_PLAYBACK && state == STATE_OPENED_WITH_KEYS) {
       state = STATE_OPENED;
       state = STATE_OPENED;
       onError(new KeysExpiredException());
       onError(new KeysExpiredException());
     }
     }

library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSessionManager.java

@@ -589,6 +589,10 @@ public class DefaultDrmSessionManager<T extends ExoMediaCrypto> implements DrmSe
 
 
   @Override
   @Override
   public void provisionRequired(DefaultDrmSession<T> session) {
   public void provisionRequired(DefaultDrmSession<T> session) {
+    if (provisioningSessions.contains(session)) {
+      // The session has already requested provisioning.
+      return;
+    }
     provisioningSessions.add(session);
     provisioningSessions.add(session);
     if (provisioningSessions.size() == 1) {
     if (provisioningSessions.size() == 1) {
       // This is the first session requesting provisioning, so have it perform the operation.
       // This is the first session requesting provisioning, so have it perform the operation.
@@ -649,6 +653,10 @@ public class DefaultDrmSessionManager<T extends ExoMediaCrypto> implements DrmSe
     @Override
     @Override
     public void handleMessage(Message msg) {
     public void handleMessage(Message msg) {
       byte[] sessionId = (byte[]) msg.obj;
       byte[] sessionId = (byte[]) msg.obj;
+      if (sessionId == null) {
+        // The event is not associated with any particular session.
+        return;
+      }
       for (DefaultDrmSession<T> session : sessions) {
       for (DefaultDrmSession<T> session : sessions) {
         if (session.hasSessionId(sessionId)) {
         if (session.hasSessionId(sessionId)) {
           session.onMediaDrmEvent(msg.what);
           session.onMediaDrmEvent(msg.what);
@@ -668,10 +676,8 @@ public class DefaultDrmSessionManager<T extends ExoMediaCrypto> implements DrmSe
         int event,
         int event,
         int extra,
         int extra,
         @Nullable byte[] data) {
         @Nullable byte[] data) {
-      if (mode == DefaultDrmSessionManager.MODE_PLAYBACK) {
       Assertions.checkNotNull(mediaDrmHandler).obtainMessage(event, sessionId).sendToTarget();
       Assertions.checkNotNull(mediaDrmHandler).obtainMessage(event, sessionId).sendToTarget();
     }
     }
-    }
 
 
   }
   }