GitLab

ChannelMultiplexer allows multiple logical channels to share a 
single underlying transport channel.

BUG=137135

Review URL: https://chromiumcodereview.appspot.com/10830046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150484 0039d316-1c4b-4281-b951-d872f2087c98