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

remoting/host/win/session_input_injector.h

Index: remoting/host/win/session_input_injector.h
diff --git a/remoting/host/win/session_input_injector.h b/remoting/host/win/session_input_injector.h
index ed818c98cd7c0df61d20e6b0c3a4797e8d5cffaf..5579f1825c65f6d601c0abbda56ae8a1f94f3f7e 100644
--- a/remoting/host/win/session_input_injector.h
+++ b/remoting/host/win/session_input_injector.h
@@ -18,18 +18,18 @@ class SingleThreadTaskRunner;
 
 namespace remoting {
 
-// Monitors and passes key/mouse events to a nested event executor. Injects
-// Secure Attention Sequence (SAS) when Ctrl+Alt+Del key combination has been
-// detected.
+// Monitors and passes key/mouse events to a nested event executor. Also handles
+// Ctrl+Alt+Del and Win+L key combinations by invoking the given callbacks.
 class SessionInputInjectorWin : public InputInjector {
  public:
-  // |inject_sas| is invoked on |inject_sas_task_runner| to generate SAS on
-  // Vista+.
+  // |inject_sas| and |lock_workstation| are invoked on
+  // |execute_action_task_runner|.
   SessionInputInjectorWin(
       scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
       std::unique_ptr<InputInjector> nested_executor,
-      scoped_refptr<base::SingleThreadTaskRunner> inject_sas_task_runner,
-      const base::Closure& inject_sas);
+      scoped_refptr<base::SingleThreadTaskRunner> execute_action_task_runner,
+      const base::Closure& inject_sas,
+      const base::Closure& lock_workstation);
   ~SessionInputInjectorWin() override;
 
   // InputInjector implementation.