Add basic perf tests for chromoting protocol.

remoting/client/chromoting_client.h

Index: remoting/client/chromoting_client.h
diff --git a/remoting/client/chromoting_client.h b/remoting/client/chromoting_client.h
index b052c9a0b6155751ecb038e1f959602bb82141c6..e164d7c9241fefce5224ef97a05a9459a4272f78 100644
--- a/remoting/client/chromoting_client.h
+++ b/remoting/client/chromoting_client.h
@@ -25,6 +25,7 @@ class SingleThreadTaskRunner;
 namespace remoting {
 
 namespace protocol {
+class CandidateSessionConfig;
 class TransportFactory;
 }  // namespace protocol
 
@@ -48,6 +49,9 @@ class ChromotingClient : public protocol::ConnectionToHost::HostEventCallback,
 
   virtual ~ChromotingClient();
 
+  void SetProtocolConfigForTests(
+      scoped_ptr<protocol::CandidateSessionConfig> config);
+
   // Start the client. Must be called on the main thread. |signal_strategy|
   // must outlive the client.
   void Start(SignalStrategy* signal_strategy,