Added support of Secure Attention Sequence in multiprocess mode.

remoting/host/desktop_session_agent_posix.cc

Index: remoting/host/desktop_session_agent_posix.cc
diff --git a/remoting/host/desktop_session_agent_posix.cc b/remoting/host/desktop_session_agent_posix.cc
index d357d23be8b90cb9f3eece08d47f0a4bf8f16396..0d4f8b23995c9e98abf3abb325855be24be95df5 100644
--- a/remoting/host/desktop_session_agent_posix.cc
+++ b/remoting/host/desktop_session_agent_posix.cc
@@ -14,6 +14,7 @@
 #include "ipc/ipc_channel.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "remoting/base/auto_thread_task_runner.h"
+#include "remoting/host/event_executor.h"
 
 namespace remoting {
 
@@ -33,6 +34,7 @@ class DesktopSessionAgentPosix : public DesktopSessionAgent {
   virtual bool CreateChannelForNetworkProcess(
       IPC::PlatformFileForTransit* client_out,
       scoped_ptr<IPC::ChannelProxy>* server_out) OVERRIDE;
+  virtual scoped_ptr<EventExecutor> CreateEventExecutor() OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DesktopSessionAgentPosix);
@@ -88,6 +90,13 @@ bool DesktopSessionAgentPosix::CreateChannelForNetworkProcess(
   return true;
 }
 
+scoped_ptr<EventExecutor> DesktopSessionAgentPosix::CreateEventExecutor() {
+  DCHECK(caller_task_runner()->BelongsToCurrentThread());
+
+  return EventExecutor::Create(input_task_runner(),
+                               caller_task_runner()).Pass();
+}
+
 // static
 scoped_refptr<DesktopSessionAgent> DesktopSessionAgent::Create(
     scoped_refptr<AutoThreadTaskRunner> caller_task_runner,