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

remoting/host/event_executor.h

Index: remoting/host/event_executor.h
diff --git a/remoting/host/event_executor.h b/remoting/host/event_executor.h
index 13fe511fc60b1e4ba232657ca99ed6331c699a64..f99339b465108f5b4585d539457fd47789994e75 100644
--- a/remoting/host/event_executor.h
+++ b/remoting/host/event_executor.h
@@ -5,7 +5,7 @@
 #ifndef REMOTING_HOST_EVENT_EXECUTOR_H_
 #define REMOTING_HOST_EVENT_EXECUTOR_H_
 
-class MessageLoop;
+class MessageLoopForUI;
 
 namespace remoting {
 
@@ -16,7 +16,7 @@ class InputStub;
 }  // namespace protocol
 
 // Creates default event executor for the current platform.
-protocol::InputStub* CreateEventExecutor(MessageLoop* message_loop,
+protocol::InputStub* CreateEventExecutor(MessageLoopForUI* message_loop,
                                          Capturer* capturer);
 
 }  // namespace remoting