Add support for multiplexed channels in remoting::protocol::Session interface.
Now the Session interface has two methods that return channel factories - one for regular channels and one for multiplexed channels. Also refactored AudioReader and AudioWriter to inherit from ChannelDispatcherBase. BUG=137135 Review URL: https://chromiumcodereview.appspot.com/10823323 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152240 0039d316-1c4b-4281-b951-d872f2087c98
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