Add support for multiplexed channels in remoting::protocol::Session interface.

remoting/protocol/channel_multiplexer.cc

Index: remoting/protocol/channel_multiplexer.cc
diff --git a/remoting/protocol/channel_multiplexer.cc b/remoting/protocol/channel_multiplexer.cc
index 71647bfe890952c34f845a0e6ff4bd6ae1c164b3..3ad87bcf0d80ac60a4ee08a8eeb8f2552549f5e1 100644
--- a/remoting/protocol/channel_multiplexer.cc
+++ b/remoting/protocol/channel_multiplexer.cc
@@ -365,10 +365,6 @@ ChannelMultiplexer::ChannelMultiplexer(ChannelFactory* factory,
       base_channel_name_(base_channel_name),
       next_channel_id_(0),
       destroyed_flag_(NULL) {
-  factory->CreateStreamChannel(
-      base_channel_name,
-      base::Bind(&ChannelMultiplexer::OnBaseChannelReady,
-                 base::Unretained(this)));
 }
 
 ChannelMultiplexer::~ChannelMultiplexer() {
@@ -396,6 +392,14 @@ void ChannelMultiplexer::CreateStreamChannel(
   } else {
     // Still waiting for the |base_channel_|.
     pending_channels_.push_back(PendingChannel(name, callback));
+
+    // If this is the first multiplexed channel then create the base channel.
+    if (pending_channels_.size() == 1U) {
+      base_channel_factory_->CreateStreamChannel(
+          base_channel_name_,
+          base::Bind(&ChannelMultiplexer::OnBaseChannelReady,
+                     base::Unretained(this)));
+    }
   }
 }