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

ui/views/controls/menu/menu_event_dispatcher_linux.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/macros.h"
+#include "ui/events/platform/platform_event_dispatcher.h"
+
+namespace views {
+
+class MenuController;
+
+namespace internal {
+
+// A message-pump dispatcher object used to dispatch events from the nested
+// message-loop initiated by the MenuController.
+class MenuEventDispatcher : public ui::PlatformEventDispatcher {
+ public:
+  explicit MenuEventDispatcher(MenuController* menu_controller);
+  virtual ~MenuEventDispatcher();
+
+ private:
+  // ui::PlatformEventDispatcher:
+  virtual bool CanDispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
+  virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
+
+  MenuController* menu_controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(MenuEventDispatcher);
+};
+
+}  // namespace internal
+}  // namespace views