Adding support for Win+L key combo in Windows host.

remoting/host/desktop_process.h

Index: remoting/host/desktop_process.h
diff --git a/remoting/host/desktop_process.h b/remoting/host/desktop_process.h
index c74133ead1058fe668b5a9581dca578cf8693d20..ec3f87ee5ef969712aac874499b2e2c572cdc1af 100644
--- a/remoting/host/desktop_process.h
+++ b/remoting/host/desktop_process.h
@@ -51,6 +51,9 @@ class DesktopProcess : public DesktopSessionAgent::Delegate,
   // Injects Secure Attention Sequence.
   void InjectSas();
 
+  // Locks the workstation for the current session.
+  void LockWorkStation();
+
   // Creates the desktop agent and required threads and IPC channels. Returns
   // true on success.
   bool Start(