Make tooltips toplevel windows on Linux

ui/views/corewm/tooltip_aura.h

 // Copyright 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.
 
 #ifndef UI_VIEWS_COREWM_TOOLTIP_AURA_H_
 #define UI_VIEWS_COREWM_TOOLTIP_AURA_H_
 
 #include "ui/gfx/screen_type_delegate.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/corewm/tooltip.h"
@@ skipping 22 matching lines @@
   static void TrimTooltipToFit(const gfx::FontList& font_list,
                                int max_width,
                                base::string16* text,
                                int* width,
                                int* line_count);
 
  private:
   // Returns the max width of the tooltip when shown at the specified location.
   int GetMaxWidth(const gfx::Point& location) const;
 
-  // Returns the bounds to fit the tooltip in.
-  gfx::Rect GetBoundsForTooltip(const gfx::Point& origin) const;
-
   // Adjusts the bounds given by the arguments to fit inside the desktop
   // and applies the adjusted bounds to the label_.
   void SetTooltipBounds(const gfx::Point& mouse_pos,
                         int tooltip_width,
                         int tooltip_height);
 
-  // Makes sure |widget_| is valid, creating as necessary.
-  void CreateWidget();
-
   // Destroys |widget_|.
   void DestroyWidget();
 
   // Tooltip:
   virtual void SetText(aura::Window* window,
                        const base::string16& tooltip_text,
                        const gfx::Point& location) OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
   virtual bool IsVisible() OVERRIDE;
@@ skipping 13 matching lines @@
   // showing.
   aura::Window* tooltip_window_;
 
   DISALLOW_COPY_AND_ASSIGN(TooltipAura);
 };
 
 }  // namespace corewm
 }  // namespace views
 
 #endif  // UI_VIEWS_COREWM_TOOLTIP_AURA_H_