MacViews: Create abstraction for event monitoring

ui/views/event_monitor.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.
+
+#ifndef UI_VIEWS_EVENT_MONITOR_H_
+#define UI_VIEWS_EVENT_MONITOR_H_
+
+#include "ui/gfx/geometry/point.h"
+#include "ui/views/views_export.h"
+
+namespace ui {
+class EventHandler;
+}
+
+namespace views {
+
+// RAII-style class that forwards events posted to the application to
+// |event_handler| before they are dispatched.
+class VIEWS_EXPORT EventMonitor {
+ public:
+  virtual ~EventMonitor() {}
+
+  static EventMonitor* Create(ui::EventHandler* event_handler);
+
+  // Returns the last mouse location seen in a mouse event in screen
+  // coordinates.
+  static gfx::Point GetLastMouseLocation();
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_EVENT_MONITOR_H_