public static com.google.devtools.cloudtrace.v2.Span.TimeEvent.MessageEvent parseFrom(
          byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
          throws com.google.protobuf.InvalidProtocolBufferException {
        return PARSER.parseFrom(data, extensionRegistry);
      }
<pre>
The number of compressed bytes sent or received. If missing, the
compressed size is assumed to be the same size as the uncompressed
size.
</pre>

<code>int64 compressed_size_bytes = 4;</code>

@return The compressedSizeBytes.
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java