Run event executor on the ui thread to remove the need to explicitly XFlush() the XTest calls.

remoting/host/event_executor_win.cc

Index: remoting/host/event_executor_win.cc
diff --git a/remoting/host/event_executor_win.cc b/remoting/host/event_executor_win.cc
index b1fe052927ae619c537c9f48b768b0725767af43..1dde64208a4b484f4761964c6ce09eb17dfc14c3 100644
--- a/remoting/host/event_executor_win.cc
+++ b/remoting/host/event_executor_win.cc
@@ -18,7 +18,7 @@ using protocol::MouseEvent;
 using protocol::KeyEvent;
 
 EventExecutorWin::EventExecutorWin(
-    MessageLoop* message_loop, Capturer* capturer)
+    MessageLoopForUI* message_loop, Capturer* capturer)
     : message_loop_(message_loop),
       capturer_(capturer) {
 }
@@ -80,7 +80,7 @@ void EventExecutorWin::HandleKey(const KeyEvent* event) {
   SendInput(1, &input, sizeof(INPUT));
 }
 
-protocol::InputStub* CreateEventExecutor(MessageLoop* message_loop,
+protocol::InputStub* CreateEventExecutor(MessageLoopForUI* message_loop,
                                          Capturer* capturer) {
   return new EventExecutorWin(message_loop, capturer);
 }