Add Seq[One,Two]ByteString to runtime test generator.
Add Seq[One,Two]ByteString to runtime test generator.

R=dcarney@chromium.org, jkummerow@chromium.org

Review URL: https://codereview.chromium.org/303543006

git-svn-id: f98b9d40cb02301bc76fa9e1b46ee668158567fd@21557 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh