Add support for dynamic channels in WebrtcTransport.

remoting/protocol/connection_tester.cc

Index: remoting/protocol/connection_tester.cc
diff --git a/remoting/protocol/connection_tester.cc b/remoting/protocol/connection_tester.cc
index 1089e3145843c015f86d827cc6330fe81277c1b7..214f6ea13a95b68091698581f3f146f4b32ed4ef 100644
--- a/remoting/protocol/connection_tester.cc
+++ b/remoting/protocol/connection_tester.cc
@@ -272,8 +272,7 @@ MessagePipeConnectionTester::MessagePipeConnectionTester(
 MessagePipeConnectionTester::~MessagePipeConnectionTester() {}
 
 void MessagePipeConnectionTester::RunAndCheckResults() {
-  host_pipe_->StartReceiving(base::Bind(
-      &MessagePipeConnectionTester::OnMessageReceived, base::Unretained(this)));
+  host_pipe_->Start(this);
 
   for (int i = 0; i < message_count_; ++i) {
     std::unique_ptr<VideoPacket> message(new VideoPacket());
@@ -301,5 +300,10 @@ void MessagePipeConnectionTester::OnMessageReceived(
   }
 }
 
+void MessagePipeConnectionTester::OnMessagePipeClosed() {
+  run_loop_.Quit();
+  FAIL();
+}
+
 }  // namespace protocol
 }  // namespace remoting