Added more metadata published by the MediaMetaDataRetriever

- presence of audio/video content
- video dimensions
- avg. bitrate

Change-Id: Ie6d478a3c2d0bb6bebaea99ac0a20a4c17808934
related-to-bug: 3506316
diff --git a/include/media/mediametadataretriever.h b/include/media/mediametadataretriever.h
index e905006..a5cb949 100644
--- a/include/media/mediametadataretriever.h
+++ b/include/media/mediametadataretriever.h
@@ -47,6 +47,12 @@
     METADATA_KEY_ALBUMARTIST     = 13,
     METADATA_KEY_DISC_NUMBER     = 14,
     METADATA_KEY_COMPILATION     = 15,
+    METADATA_KEY_HAS_AUDIO       = 16,
+    METADATA_KEY_HAS_VIDEO       = 17,
+    METADATA_KEY_VIDEO_WIDTH     = 18,
+    METADATA_KEY_VIDEO_HEIGHT    = 19,
+    METADATA_KEY_BITRATE         = 20,
+
     // Add more here...
 };