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

remoting/host/win/session_desktop_environment.h

Index: remoting/host/win/session_desktop_environment.h
diff --git a/remoting/host/win/session_desktop_environment.h b/remoting/host/win/session_desktop_environment.h
index a74f6fcd055f1e376862623791fb12fdf83c4d11..53248f6600128cc65f83ea0b51d0eafbaf988094 100644
--- a/remoting/host/win/session_desktop_environment.h
+++ b/remoting/host/win/session_desktop_environment.h
@@ -30,11 +30,15 @@ class SessionDesktopEnvironment : public Me2MeDesktopEnvironment {
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
       const base::Closure& inject_sas,
+      const base::Closure& lock_workstation,
       bool supports_touch_events);
 
   // Used to ask the daemon to inject Secure Attention Sequence.
   base::Closure inject_sas_;
 
+  // Used to lock the workstation for the current session.
+  base::Closure lock_workstation_;
+
   DISALLOW_COPY_AND_ASSIGN(SessionDesktopEnvironment);
 };
 
@@ -46,7 +50,8 @@ class SessionDesktopEnvironmentFactory : public Me2MeDesktopEnvironmentFactory {
       scoped_refptr<base::SingleThreadTaskRunner> video_capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
-      const base::Closure& inject_sas);
+      const base::Closure& inject_sas,
+      const base::Closure& lock_workstation);
   ~SessionDesktopEnvironmentFactory() override;
 
   // DesktopEnvironmentFactory implementation.
@@ -57,6 +62,9 @@ class SessionDesktopEnvironmentFactory : public Me2MeDesktopEnvironmentFactory {
   // Used to ask the daemon to inject Secure Attention Sequence.
   base::Closure inject_sas_;
 
+  // Used to lock the workstation for the current session.
+  base::Closure lock_workstation_;
+
   DISALLOW_COPY_AND_ASSIGN(SessionDesktopEnvironmentFactory);
 };