x11: Move X event handling out of the message-pump.

ash/shell_unittest.cc

Index: ash/shell_unittest.cc
diff --git a/ash/shell_unittest.cc b/ash/shell_unittest.cc
index 781b32a638816ea173100ed12819bf008ca776b0..803c4a94bebd258fd8b10e6ee20f808fdde7cdb7 100644
--- a/ash/shell_unittest.cc
+++ b/ash/shell_unittest.cc
@@ -29,6 +29,7 @@
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/models/simple_menu_model.h"
+#include "ui/events/platform/platform_event_source.h"
 #include "ui/events/test/events_test_utils.h"
 #include "ui/events/test/test_event_handler.h"
 #include "ui/gfx/size.h"
@@ -374,6 +375,8 @@ TEST_F(ShellTest, IsScreenLocked) {
 }
 
 TEST_F(ShellTest, LockScreenClosesActiveMenu) {
+  scoped_ptr<ui::PlatformEventSource> event_source(
+      ui::PlatformEventSource::CreateDefault());
   SimpleMenuDelegate menu_delegate;
   scoped_ptr<ui::SimpleMenuModel> menu_model(
       new ui::SimpleMenuModel(&menu_delegate));