aura: Start using EventPrcessor interface for event dispatch.

ui/aura/window_targeter.h

 // Copyright (c) 2013 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 "ui/events/event_targeter.h"
 
 namespace aura {
 
+class Window;
+
 class WindowTargeter : public ui::EventTargeter {
  public:
   WindowTargeter();
   virtual ~WindowTargeter();
 
  protected:
   // ui::EventTargeter:
   virtual ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
                                               ui::Event* event) OVERRIDE;
+  virtual ui::EventTarget* FindTargetForLocatedEvent(
+      ui::EventTarget* root,
+      ui::LocatedEvent* event) OVERRIDE;
   virtual bool SubtreeShouldBeExploredForEvent(
       ui::EventTarget* target,
       const ui::LocatedEvent& event) OVERRIDE;
 
+ private:
+  Window* FindTargetInRootWindow(Window* root_window,
+                                 const ui::LocatedEvent& event);
+
   DISALLOW_COPY_AND_ASSIGN(WindowTargeter);
 };
 
 }  // namespace aura