Fix incorrect anamorphic handling in Leanback extension

The leanback library doesn't know about non-square pixels. So if
we're playing content that uses non-square pixels, we need to adjust
the video dimensions that we provide to leanback such that it
renders the video with the correct aspect ratio.

PiperOrigin-RevId: 277042560

extensions/leanback/src/main/java/com/google/android/exoplayer2/ext/leanback/LeanbackPlayerAdapter.java

@@ -307,7 +307,11 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter implements Runnab
     @Override
     public void onVideoSizeChanged(
         int width, int height, int unappliedRotationDegrees, float pixelWidthHeightRatio) {
-      getCallback().onVideoSizeChanged(LeanbackPlayerAdapter.this, width, height);
+      // 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.
+      int scaledWidth = Math.round(width * pixelWidthHeightRatio);
+      getCallback().onVideoSizeChanged(LeanbackPlayerAdapter.this, scaledWidth, height);
     }
 
     @Override