Adding the base ChromotingInstance implementation and unittests. This class will be used by the ap…

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 94c8f4ea9083d703b68c956a4caee1082b16b291..e11a6d5ae95cdc9af25aa1aa0ff54f42ae64f4c9 100644
--- a/remoting/client/chromoting_client.h
+++ b/remoting/client/chromoting_client.h
@@ -51,8 +51,11 @@ class ChromotingClient : public protocol::ConnectionToHost::HostEventCallback,
 
   ~ChromotingClient() override;
 
+  // Used to set fake/mock objects for tests which use the ChromotingClient.
   void SetProtocolConfigForTests(
       scoped_ptr<protocol::CandidateSessionConfig> config);
+  void SetConnectionToHostForTests(
+      scoped_ptr<protocol::ConnectionToHost> connection_to_host);
 
   // Start the client. Must be called on the main thread. |signal_strategy|
   // must outlive the client.
@@ -63,14 +66,14 @@ class ChromotingClient : public protocol::ConnectionToHost::HostEventCallback,
              const std::string& capabilities);
 
   protocol::ConnectionToHost::State connection_state() const {
-    return connection_.state();
+    return connection_->state();
   }
 
   protocol::ClipboardStub* clipboard_forwarder() {
-    return connection_.clipboard_forwarder();
+    return connection_->clipboard_forwarder();
   }
-  protocol::HostStub* host_stub() { return connection_.host_stub(); }
-  protocol::InputStub* input_stub() { return connection_.input_stub(); }
+  protocol::HostStub* host_stub() { return connection_->host_stub(); }
+  protocol::InputStub* input_stub() { return connection_->input_stub(); }
 
   // ClientStub implementation.
   void SetCapabilities(const protocol::Capabilities& capabilities) override;
@@ -103,7 +106,7 @@ class ChromotingClient : public protocol::ConnectionToHost::HostEventCallback,
   ClientUserInterface* user_interface_;
   VideoRenderer* video_renderer_;
 
-  protocol::ConnectionToHost connection_;
+  scoped_ptr<protocol::ConnectionToHost> connection_;
 
   scoped_ptr<AudioDecodeScheduler> audio_decode_scheduler_;