Introduce the MicButtonTargeter class

ui/views/view.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_VIEWS_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 707 matching lines @@
   // Sets a new event-targeter for the view, and returns the previous
   // event-targeter.
   scoped_ptr<ui::EventTargeter> SetEventTargeter(
       scoped_ptr<ui::EventTargeter> targeter);
 
   // Overridden from ui::EventTarget:
   virtual bool CanAcceptEvent(const ui::Event& event) OVERRIDE;
   virtual ui::EventTarget* GetParentTarget() OVERRIDE;
   virtual scoped_ptr<ui::EventTargetIterator> GetChildIterator() const OVERRIDE;
   virtual ui::EventTargeter* GetEventTargeter() OVERRIDE;
+  ui::EventTargeter* GetEventTargeter() const;
   virtual void ConvertEventToTarget(ui::EventTarget* target,
                                     ui::LocatedEvent* event) OVERRIDE;
 
   // Overridden from ui::EventHandler:
   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
   virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE FINAL;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
@@ skipping 868 matching lines @@
   // Belongs to this view, but it's reference-counted on some platforms
   // so we can't use a scoped_ptr. It's dereferenced in the destructor.
   NativeViewAccessibility* native_view_accessibility_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_