Prevent forwarding of zero video size to Leanback

Leanback isn't prepared to handle these values and will throw
ArithmeticExceptions.

Issue: androidx/media#617
PiperOrigin-RevId: 561413740

RELEASENOTES.md

@@ -50,6 +50,9 @@
         ([#577](https://github.com/androidx/media/issues/577)).
 *   Decoder Extensions (FFmpeg, VP9, AV1, etc.):
 *   MIDI extension:
+*   Leanback extension:
+    *   Fix bug where disabling a surface can cause an `ArithmeticException` in
+        Leanback code ([#617](https://github.com/androidx/media/issues/617)).
 *   Cast Extension:
 *   Test Utilities:
 *   Remove deprecated symbols:

libraries/ui_leanback/src/main/java/androidx/media3/ui/leanback/LeanbackPlayerAdapter.java

@@ -286,6 +286,11 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter implements Runnab
     @SuppressWarnings("nullness:dereference.of.nullable")
     @Override
     public void onVideoSizeChanged(VideoSize videoSize) {
+      if (videoSize.width == 0 || videoSize.height == 0) {
+        // Do not report unknown or placeholder sizes as Leanback can't handle these cases correctly
+        // (see https://github.com/androidx/media/issues/617).
+        return;
+      }
       // There's no way to pass pixelWidthHeightRatio to leanback, so we scale the width that we
       // pass to take it into account. This is necessary to ensure that leanback uses the correct
       // aspect ratio when playing content with non-square pixels.