Fix Dackka/Metalava errors in test_utils module

This involves reducing the visibility of methods/constructors that
are already unusable outside the `androidx.media3.test.utils` package.

#minor-release

PiperOrigin-RevId: 487473005
(cherry picked from commit 3ab881351e04bcf921f946c8e74e4a0cf5989768)

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

@@ -66,6 +66,18 @@ public abstract class Action {
     this.description = description;
   }
 
+  /**
+   * Called by {@link #doActionAndScheduleNextImpl(ExoPlayer, DefaultTrackSelector, Surface,
+   * HandlerWrapper, ActionNode)} to perform the action.
+   *
+   * @param player The player to which the action should be applied.
+   * @param trackSelector The track selector to which the action should be applied.
+   * @param surface The surface to use when applying actions, or {@code null} if no surface is
+   *     needed.
+   */
+  protected abstract void doActionImpl(
+      ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface);
+
   /**
    * Executes the action and schedules the next.
    *
@@ -77,7 +89,7 @@ public abstract class Action {
    * @param nextAction The next action to schedule immediately after this action finished, or {@code
    *     null} if there's no next action.
    */
-  public final void doActionAndScheduleNext(
+  /* package */ final void doActionAndScheduleNext(
       ExoPlayer player,
       DefaultTrackSelector trackSelector,
       @Nullable Surface surface,
@@ -101,7 +113,7 @@ public abstract class Action {
    * @param nextAction The next action to schedule immediately after this action finished, or {@code
    *     null} if there's no next action.
    */
-  protected void doActionAndScheduleNextImpl(
+  /* package */ void doActionAndScheduleNextImpl(
       ExoPlayer player,
       DefaultTrackSelector trackSelector,
       @Nullable Surface surface,
@@ -113,18 +125,6 @@ public abstract class Action {
     }
   }
 
-  /**
-   * Called by {@link #doActionAndScheduleNextImpl(ExoPlayer, DefaultTrackSelector, Surface,
-   * HandlerWrapper, ActionNode)} to perform the action.
-   *
-   * @param player The player to which the action should be applied.
-   * @param trackSelector The track selector to which the action should be applied.
-   * @param surface The surface to use when applying actions, or {@code null} if no surface is
-   *     needed.
-   */
-  protected abstract void doActionImpl(
-      ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface);
-
   /** Calls {@link Player#seekTo(long)} or {@link Player#seekTo(int, long)}. */
   public static final class Seek extends Action {
 
@@ -697,7 +697,13 @@ public abstract class Action {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -739,12 +745,6 @@ public abstract class Action {
       }
       player.play();
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 
   /** Waits for {@link Player.Listener#onTimelineChanged(Timeline, int)}. */
@@ -785,7 +785,13 @@ public abstract class Action {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -813,12 +819,6 @@ public abstract class Action {
         nextAction.schedule(player, trackSelector, surface, handler);
       }
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 
   /**
@@ -835,7 +835,13 @@ public abstract class Action {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -856,12 +862,6 @@ public abstract class Action {
             }
           });
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 
   /**
@@ -882,7 +882,13 @@ public abstract class Action {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -907,12 +913,6 @@ public abstract class Action {
             });
       }
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 
   /**
@@ -933,7 +933,13 @@ public abstract class Action {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -957,12 +963,6 @@ public abstract class Action {
             });
       }
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 
   /**
@@ -983,7 +983,13 @@ public abstract class Action {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -997,12 +1003,6 @@ public abstract class Action {
 
       playerTarget.setCallback(callback);
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 
   /**
@@ -1023,7 +1023,13 @@ public abstract class Action {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -1047,12 +1053,6 @@ public abstract class Action {
             });
       }
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 
   /** Waits until the player acknowledged all pending player commands. */
@@ -1066,7 +1066,13 @@ public abstract class Action {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -1084,12 +1090,6 @@ public abstract class Action {
           .setLooper(Util.getCurrentOrMainLooper())
           .send();
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 
   /** Calls {@code Runnable.run()}. */

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

@@ -829,7 +829,13 @@ public final class ActionSchedule {
     }
 
     @Override
-    protected void doActionAndScheduleNextImpl(
+    protected void doActionImpl(
+        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
+      // Not triggered.
+    }
+
+    @Override
+    /* package */ void doActionAndScheduleNextImpl(
         ExoPlayer player,
         DefaultTrackSelector trackSelector,
         @Nullable Surface surface,
@@ -841,11 +847,5 @@ public final class ActionSchedule {
         handler.post(callback::onActionScheduleFinished);
       }
     }
-
-    @Override
-    protected void doActionImpl(
-        ExoPlayer player, DefaultTrackSelector trackSelector, @Nullable Surface surface) {
-      // Not triggered.
-    }
   }
 }

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

@@ -286,7 +286,7 @@ public class FakeClock implements Clock {
     private final int arg2;
     @Nullable private final Object obj;
 
-    public HandlerMessage(
+    private HandlerMessage(
         long timeMs,
         ClockHandler handler,
         int what,