wireproto: start to associate frame generation with a stream
An upcoming commit will introduce "streams" into the frame-based wire
protocol. In preparation for this invasive change, we introduce a basic
"stream" class and have all operations that create frames also operate
alongside a stream instance.
Differential Revision: https://phab.mercurial-scm.org/D2906
#require test-repo jshint hg10
$ . "$TESTDIR/helpers-testrepo.sh"
run jshint on all tracked files ending in .js except vendored dependencies
$ cd "`dirname "$TESTDIR"`"
$ testrepohg locate 'set:**.js' \
> 2>/dev/null \
> | xargs jshint