MacViews: Implement event monitoring for a specific window

ui/views/event_monitor.h

Index: ui/views/event_monitor.h
diff --git a/ui/views/event_monitor.h b/ui/views/event_monitor.h
index 277321909fd0346963c60e1da7a6cfa95c6269eb..7d0ba005e1b43fc53784fe3c672bab551f3b4e34 100644
--- a/ui/views/event_monitor.h
+++ b/ui/views/event_monitor.h
@@ -6,6 +6,7 @@
 #define UI_VIEWS_EVENT_MONITOR_H_
 
 #include "ui/gfx/geometry/point.h"
+#include "ui/gfx/native_widget_types.h"
 #include "ui/views/views_export.h"
 
 namespace ui {
@@ -21,6 +22,8 @@ class VIEWS_EXPORT EventMonitor {
   virtual ~EventMonitor() {}
 
   static EventMonitor* Create(ui::EventHandler* event_handler);
+  static EventMonitor* Create(ui::EventHandler* event_handler,
+                              gfx::NativeWindow target_window);
 
   // Returns the last mouse location seen in a mouse event in screen
   // coordinates.