Enable tooltips for aura.

views/widget/native_widget_aura.h

 // Copyright (c) 2011 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 VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 #define VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 #pragma once
 
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 140 matching lines @@
   Widget::InitParams::Ownership ownership_;
 
   // The following factory is used for calls to close the NativeWidgetAura
   // instance.
   base::WeakPtrFactory<NativeWidgetAura> close_widget_factory_;
 
   bool can_activate_;
 
   gfx::NativeCursor cursor_;
 
+  scoped_ptr<TooltipManager> tooltip_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_