Merge "stagefright: MPEG4Extractor: allow 'hdlr' box before first track" into klp-dev

            // shall be 'text'. We also want to support 'sbtl' handler type

            // for a practical reason as various MPEG4 containers use it.

            if (type == FOURCC('t', 'e', 'x', 't') || type == FOURCC('s', 'b', 't', 'l')) {

                if (mLastTrack != NULL) {

                    mLastTrack->meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_TEXT_3GPP);

                }

            }

            *offset += chunk_size;

            break;