Provide access to the ID for the remoted Windows session in the network process

remoting/host/desktop_session_proxy.h

Index: remoting/host/desktop_session_proxy.h
diff --git a/remoting/host/desktop_session_proxy.h b/remoting/host/desktop_session_proxy.h
index 55591463dbbdf45bb21ce136b32a89115883f8b5..01222a825dca5e99ce67d3e41bdf297958feedbb 100644
--- a/remoting/host/desktop_session_proxy.h
+++ b/remoting/host/desktop_session_proxy.h
@@ -5,8 +5,7 @@
 #ifndef REMOTING_HOST_DESKTOP_SESSION_PROXY_H_
 #define REMOTING_HOST_DESKTOP_SESSION_PROXY_H_
 
-#include <stdint.h>
-
+#include <cstdint>
 #include <map>
 #include <memory>
 
@@ -44,7 +43,6 @@ struct SerializedDesktopFrame;
 namespace remoting {
 
 class AudioPacket;
-class ClientSession;
 class ClientSessionControl;
 class DesktopSessionConnector;
 struct DesktopSessionProxyTraits;
@@ -136,6 +134,8 @@ class DesktopSessionProxy
   // API used to implement the SessionController interface.
   void SetScreenResolution(const ScreenResolution& resolution);
 
+  uint32_t desktop_session_id() const { return desktop_session_id_; }
+
  private:
   friend class base::DeleteHelper<DesktopSessionProxy>;
   friend struct DesktopSessionProxyTraits;
@@ -226,6 +226,9 @@ class DesktopSessionProxy
   // True if touch events are supported by the desktop session.
   bool supports_touch_events_;
 
+  // Stores the session id for the proxied desktop process.
+  uint32_t desktop_session_id_ = UINT32_MAX;
+
   DISALLOW_COPY_AND_ASSIGN(DesktopSessionProxy);
 };