Add a method to distinguish whether a player can be set by MediaSession

PiperOrigin-RevId: 388835913

library/common/src/main/java/com/google/android/exoplayer2/BasePlayer.java

@@ -89,6 +89,16 @@ public abstract class BasePlayer implements Player {
     return getAvailableCommands().contains(command);
   }
 
+  /**
+   * {@inheritDoc}
+   *
+   * <p>BasePlayer and its descendents will return {@code true}.
+   */
+  @Override
+  public final boolean canAdvertiseSession() {
+    return true;
+  }
+
   @Override
   public final void play() {
     setPlayWhenReady(true);

library/common/src/main/java/com/google/android/exoplayer2/ForwardingPlayer.java

@@ -151,6 +151,11 @@ public class ForwardingPlayer implements Player {
     return player.isCommandAvailable(command);
   }
 
+  @Override
+  public boolean canAdvertiseSession() {
+    return player.canAdvertiseSession();
+  }
+
   @Override
   public Commands getAvailableCommands() {
     return player.getAvailableCommands();

library/common/src/main/java/com/google/android/exoplayer2/Player.java

@@ -1543,6 +1543,9 @@ public interface Player {
    */
   boolean isCommandAvailable(@Command int command);
 
+  /** Returns whether the player can be used to advertise a media session. */
+  boolean canAdvertiseSession();
+
   /**
    * Returns the player's currently available {@link Commands}.
    *