Ensure that in Desktop AURA the WindowModalityController class is at the head of the event pre targ…

ui/events/event_target.h

 // Copyright (c) 2012 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_EVENTS_EVENT_TARGET_H_
 #define UI_EVENTS_EVENT_TARGET_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/events/event_handler.h"
@@ skipping 52 matching lines @@
   // of the list so it is the first one to receive events.
   void PrependPreTargetHandler(EventHandler* handler);
   void RemovePreTargetHandler(EventHandler* handler);
 
   // Adds a handler to receive events after the target. The handler must be
   // explicitly removed from the target before the handler is destroyed. The
   // EventTarget does not take ownership of the handler.
   void AddPostTargetHandler(EventHandler* handler);
   void RemovePostTargetHandler(EventHandler* handler);
 
+  // Returns true if the event pre target list is empty.
+  bool IsPreTargetListEmpty() const;
+
  protected:
   void set_target_handler(EventHandler* handler) {
     target_handler_ = handler;
   }
 
   // Overridden from EventHandler:
   virtual void OnEvent(Event* event) OVERRIDE;
   virtual void OnKeyEvent(KeyEvent* event) OVERRIDE;
   virtual void OnMouseEvent(MouseEvent* event) OVERRIDE;
   virtual void OnScrollEvent(ScrollEvent* event) OVERRIDE;
@@ skipping 16 matching lines @@
   EventHandlerList pre_target_list_;
   EventHandlerList post_target_list_;
   EventHandler* target_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(EventTarget);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_TARGET_H_