NuPlayer: add missing getSelectedTrack in CCDecoder

Test: cts
Bug: 119938763
Change-Id: I0dcc35ec65f0912d43aa5b0e3a797334d2581a78
diff --git a/media/libmediaplayer2/nuplayer2/NuPlayer2CCDecoder.h b/media/libmediaplayer2/nuplayer2/NuPlayer2CCDecoder.h
index 57d5ea2..97834d1 100644
--- a/media/libmediaplayer2/nuplayer2/NuPlayer2CCDecoder.h
+++ b/media/libmediaplayer2/nuplayer2/NuPlayer2CCDecoder.h
@@ -38,6 +38,7 @@
     size_t getTrackCount() const;
     sp<AMessage> getTrackInfo(size_t index) const;
     status_t selectTrack(size_t index, bool select);
+    ssize_t getSelectedTrack(media_track_type type) const;
     bool isSelected() const;
     void decode(const sp<ABuffer> &accessUnit);
     void display(int64_t timeUs);