Fix the wrong relative coordinates from EventDispatch

ui/aura/window_event_dispatcher.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_AURA_WINDOW_EVENT_DISPATCHER_H_
 #define UI_AURA_WINDOW_EVENT_DISPATCHER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 60 matching lines @@
   // types (although the latter is currently a no-op).
   void RepostEvent(const ui::LocatedEvent& event);
 
   // Invoked when the mouse events get enabled or disabled.
   void OnMouseEventsEnableStateChanged(bool enabled);
 
   void DispatchCancelModeEvent();
 
   // Dispatches a ui::ET_MOUSE_EXITED event at |point|.
   // TODO(beng): needed only for WTH::OnCursorVisibilityChanged().
-  ui::EventDispatchDetails DispatchMouseExitAtPoint(
-      const gfx::Point& point) WARN_UNUSED_RESULT;
+  ui::EventDispatchDetails DispatchMouseExitAtPoint(Window* window,

[sky, 2015/01/06 16:51:30]

You need to document what |window| and |target| on 155 are. You should rename
|window| here to |target| for better consistency.

[Miyoung Shin, 2015/01/07 07:30:48]

ok. 

+                                                    const gfx::Point& point)
+      WARN_UNUSED_RESULT;
 
   // Gesture Recognition -------------------------------------------------------
 
   // When a touch event is dispatched to a Window, it may want to process the
   // touch event asynchronously. In such cases, the window should consume the
   // event during the event dispatch. Once the event is properly processed, the
   // window should let the WindowEventDispatcher know about the result of the
   // event processing, so that gesture events can be properly created and
   // dispatched. |event|'s location should be in the dispatcher's coordinate
   // space, in DIPs.
@@ skipping 51 matching lines @@
   // coordinate. But the event processing from WindowEventDispatcher onwards
   // happen in device-independent pixel coordinate. So it is necessary to update
   // the event received from the host.
   void TransformEventForDeviceScaleFactor(ui::LocatedEvent* event);
 
   // Dispatches OnMouseExited to the |window| which is hiding if necessary.
   void DispatchMouseExitToHidingWindow(Window* window);
 
   // Dispatches the specified event type (intended for enter/exit) to the
   // |mouse_moved_handler_|.
-  ui::EventDispatchDetails DispatchMouseEnterOrExit(
-      const ui::MouseEvent& event,
-      ui::EventType type) WARN_UNUSED_RESULT;
+  ui::EventDispatchDetails DispatchMouseEnterOrExit(Window* target,
+                                                    const ui::MouseEvent& event,
+                                                    ui::EventType type)
+      WARN_UNUSED_RESULT;
   ui::EventDispatchDetails ProcessGestures(
       ui::GestureRecognizer::Gestures* gestures) WARN_UNUSED_RESULT;
 
   // Called when a window becomes invisible, either by being removed
   // from root window hierarchy, via SetVisible(false) or being destroyed.
   // |reason| specifies what triggered the hiding. Note that becoming invisible
   // will cause a window to lose capture and some windows may destroy themselves
   // on capture (like DragDropTracker).
   void OnWindowHidden(Window* invisible, WindowHiddenReason reason);
 
@@ skipping 95 matching lines @@
 
   // Used to schedule DispatchHeldEvents() when |move_hold_count_| goes to 0.
   base::WeakPtrFactory<WindowEventDispatcher> held_event_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowEventDispatcher);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_EVENT_DISPATCHER_H_