Enable tooltips for aura.

ui/aura/window.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 UI_AURA_WINDOW_H_
 #define UI_AURA_WINDOW_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 50 matching lines @@
   // window_types.h or a user defined value.
   int type() const { return type_; }
   void SetType(int type);
 
   int id() const { return id_; }
   void set_id(int id) { id_ = id; }
 
   const std::string& name() const { return name_; }
   void set_name(const std::string& name) { name_ = name; }
 
+  const string16& tooltip() const { return tooltip_; }

[Ben Goodger (Google), 2011/10/25 22:24:45]

Seems like at the shell level we are always querying the TTM for the current
text... so we don't need to carry this anywhere...

[varunjain, 2011/10/25 22:35:05]

I am not sure I completely understand. We never query the TTM.. in fact TTM is
the one that queries the window or view currently under the mouse cursor for the
current tooltip.

+  void set_tooltip(const string16& tooltip) { tooltip_ = tooltip; }
+
   ui::Layer* layer() { return layer_.get(); }
   const ui::Layer* layer() const { return layer_.get(); }
 
   WindowDelegate* delegate() { return delegate_; }
 
   const gfx::Rect& bounds() const;
 
   Window* parent() { return parent_; }
   const Window* parent() const { return parent_; }
 
@@ skipping 230 matching lines @@
 
   // The Window's parent.
   Window* parent_;
 
   // Child windows. Topmost is last.
   Windows children_;
 
   int id_;
   std::string name_;
 
+  string16 tooltip_;
+
   scoped_ptr<EventFilter> event_filter_;
   scoped_ptr<LayoutManager> layout_manager_;
 
   void* user_data_;
 
   // When true, events are not sent to windows behind this one in the z-order,
   // provided this window has children. See set_stops_event_propagation().
   bool stops_event_propagation_;
 
   ObserverList<WindowObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_H_