Added method to get metadata out of the player.

The method passes a list of metadata ids to be retrieved and
a parcel where the metadata records should be appended.

If the list of ids is empty, all the metadata should be returned.
diff --git a/include/media/PVPlayer.h b/include/media/PVPlayer.h
index d8a677f..40ccc14 100644
--- a/include/media/PVPlayer.h
+++ b/include/media/PVPlayer.h
@@ -53,6 +53,8 @@
     virtual status_t    setLooping(int loop);
     virtual player_type playerType() { return PV_PLAYER; }
     virtual status_t    invoke(const Parcel& request, Parcel *reply);
+    virtual status_t    getMetadata(const SortedVector<MetadataType>& ids,
+                                    Parcel *records);
 
     // make available to PlayerDriver
     void        sendEvent(int msg, int ext1=0, int ext2=0) { MediaPlayerBase::sendEvent(msg, ext1, ext2); }