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

remoting/host/chromoting_host_context.cc

Index: remoting/host/chromoting_host_context.cc
diff --git a/remoting/host/chromoting_host_context.cc b/remoting/host/chromoting_host_context.cc
index 053f4117938ac4a1249b8d180fc02b91ca70ee33..8ed61afc29265a71a1ba4f980473f42b495bef46 100644
--- a/remoting/host/chromoting_host_context.cc
+++ b/remoting/host/chromoting_host_context.cc
@@ -11,9 +11,10 @@
 
 namespace remoting {
 
-ChromotingHostContext::ChromotingHostContext()
+ChromotingHostContext::ChromotingHostContext(MessageLoop* ui_message_loop)
     : main_thread_("ChromotingMainThread"),
-      encode_thread_("ChromotingEncodeThread") {
+      encode_thread_("ChromotingEncodeThread"),
+      ui_message_loop_(ui_message_loop) {
 }
 
 ChromotingHostContext::~ChromotingHostContext() {
@@ -49,4 +50,8 @@ MessageLoop* ChromotingHostContext::network_message_loop() {
   return jingle_thread_.message_loop();
 }
 
+MessageLoop* ChromotingHostContext::ui_message_loop() {
+  return ui_message_loop_;
+}
+
 }  // namespace remoting