Pass the desktop session ID to the remoting network process.

remoting/host/desktop_session_connector.h

Index: remoting/host/desktop_session_connector.h
diff --git a/remoting/host/desktop_session_connector.h b/remoting/host/desktop_session_connector.h
index c4993b4a308907aa1758e894b0c5bc51cb9a4ea5..6a6af7dcebd83299ab7aa474f4ce148285041042 100644
--- a/remoting/host/desktop_session_connector.h
+++ b/remoting/host/desktop_session_connector.h
@@ -41,10 +41,12 @@ class DesktopSessionConnector {
       const ScreenResolution& resolution) = 0;
 
   // Notifies the network process that |terminal_id| is now attached to
-  // a desktop integration process. |desktop_pipe| is the client end of the pipe
-  // opened by the desktop process.
+  // a desktop integration process. |session_id| is the id of the desktop
+  // session being attached. |desktop_pipe| is the client end of the pipe opened
+  // by the desktop process.
   virtual void OnDesktopSessionAgentAttached(
       int terminal_id,
+      int session_id,
       const IPC::ChannelHandle& desktop_pipe) = 0;
 
   // Notifies the network process that the daemon has disconnected the desktop