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

remoting/host/win/session_desktop_environment.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_HOST_WIN_SESSION_DESKTOP_ENVIRONMENT_H_
 #define REMOTING_HOST_WIN_SESSION_DESKTOP_ENVIRONMENT_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
@@ skipping 12 matching lines @@
   std::unique_ptr<InputInjector> CreateInputInjector() override;
 
  private:
   friend class SessionDesktopEnvironmentFactory;
   SessionDesktopEnvironment(
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
       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& 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);
 };
 
 // Used to create |SessionDesktopEnvironment| instances.
 class SessionDesktopEnvironmentFactory : public Me2MeDesktopEnvironmentFactory {
  public:
   SessionDesktopEnvironmentFactory(
       scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
       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.
   std::unique_ptr<DesktopEnvironment> Create(
       base::WeakPtr<ClientSessionControl> client_session_control) override;
 
  private:
   // 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);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_WIN_SESSION_DESKTOP_ENVIRONMENT_H_