aura: Fix WidgetFocusChangeListener::OnNativeFocusChange().

ui/aura/window_delegate.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_AURA_WINDOW_DELEGATE_H_
 #define UI_AURA_WINDOW_DELEGATE_H_
 #pragma once
 
 #include "ui/aura/aura_export.h"
 #include "ui/base/events.h"
@@ skipping 19 matching lines @@
 class AURA_EXPORT WindowDelegate {
  public:
   // Returns the window's minimum size, or size 0,0 if there is no limit.
   virtual gfx::Size GetMinimumSize() const = 0;
 
   // Called when the Window's position and/or size changes.
   virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
                                const gfx::Rect& new_bounds) = 0;
 
   // Sent to the Window's delegate when the Window gains or loses focus.
-  virtual void OnFocus() = 0;
+  virtual void OnFocus(aura::Window* old_focused_window) = 0;
   virtual void OnBlur() = 0;
 
   virtual bool OnKeyEvent(KeyEvent* event) = 0;
 
   // Returns the native cursor for the specified point, in window coordinates,
   // or NULL for the default cursor.
   virtual gfx::NativeCursor GetCursor(const gfx::Point& point) = 0;
 
   // Returns the non-client component (see hit_test.h) containing |point|, in
   // window coordinates.
@@ skipping 50 matching lines @@
   // above returns true.
   virtual void GetHitTestMask(gfx::Path* mask) const = 0;
 
  protected:
   virtual ~WindowDelegate() {}
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_DELEGATE_H_