Added support of Secure Attention Sequence in multiprocess mode.

remoting/host/desktop_session_win.cc

Index: remoting/host/desktop_session_win.cc
diff --git a/remoting/host/desktop_session_win.cc b/remoting/host/desktop_session_win.cc
index 8472e127160aad5e375fc2f7570311ac210a5b40..ac287643eabe70c1a6a07f6b1ea5a7f980a0d6ee 100644
--- a/remoting/host/desktop_session_win.cc
+++ b/remoting/host/desktop_session_win.cc
@@ -9,6 +9,7 @@
 #include "remoting/base/auto_thread_task_runner.h"
 #include "remoting/host/chromoting_messages.h"
 #include "remoting/host/daemon_process.h"
+#include "remoting/host/sas_injector.h"
 #include "remoting/host/win/worker_process_launcher.h"
 #include "remoting/host/win/wts_console_monitor.h"
 #include "remoting/host/win/wts_session_process_delegate.h"
@@ -72,6 +73,8 @@ bool DesktopSessionWin::OnMessageReceived(const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP(DesktopSessionWin, message)
     IPC_MESSAGE_HANDLER(ChromotingDesktopDaemonMsg_DesktopAttached,
                         OnDesktopSessionAgentAttached)
+    IPC_MESSAGE_HANDLER(ChromotingDesktopDaemonMsg_InjectSas,
+                        OnInjectSas)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -128,6 +131,20 @@ void DesktopSessionWin::OnDesktopSessionAgentAttached(
   }
 }
 
+void DesktopSessionWin::OnInjectSas() {
+  DCHECK(main_task_runner_->BelongsToCurrentThread());
+
+  // Do not try to inject SAS if the desktop process is not running. This can
+  // happen when  the session has detached from the console for instance.
+  if (!launcher_)
+    return;
+
+  if (!sas_injector_)
+    sas_injector_ = SasInjector::Create();
+  if (!sas_injector_->InjectSas())
+    LOG(ERROR) << "Failed to inject Secure Attention Sequence.";
+}
+
 void DesktopSessionWin::RestartDesktopProcess(
     const tracked_objects::Location& location) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());