Aura tooltips do not move on mouse move in case of many neighboring views with the same label

ui/views/corewm/tooltip_controller.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_VIEWS_COREWM_TOOLTIP_CONTROLLER_H_
 #define UI_VIEWS_COREWM_TOOLTIP_CONTROLLER_H_
 
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 43 matching lines @@
 
   const gfx::Point& mouse_location() const { return curr_mouse_loc_; }
 
  private:
   friend class test::TooltipControllerTestHelper;
 
   void TooltipTimerFired();
   void TooltipShownTimerFired();
 
   // Updates the tooltip if required (if there is any change in the tooltip
-  // text or the aura::Window.
+  // text, tooltip id or the aura::Window).
   void UpdateIfRequired();
 
   // Only used in tests.
   bool IsTooltipVisible();
 
   bool IsDragDropInProgress();
 
   // Returns true if the cursor is visible.
   bool IsCursorVisible();
 
   int GetTooltipShownTimeout();
 
   // Sets tooltip window to |target| if it is different from existing window.
   // Calls RemoveObserver on the existing window if it is not NULL.
   // Calls AddObserver on the new window if it is not NULL.
   void SetTooltipWindow(aura::Window* target);
 
   aura::Window* tooltip_window_;
   base::string16 tooltip_text_;
+  const void* tooltip_id_;
 
   // These fields are for tracking state when the user presses a mouse button.
   aura::Window* tooltip_window_at_mouse_press_;
   base::string16 tooltip_text_at_mouse_press_;
 
   scoped_ptr<Tooltip> tooltip_;
 
   base::RepeatingTimer<TooltipController> tooltip_timer_;
 
   // Timer to timeout the life of an on-screen tooltip. We hide the tooltip when
   // this timer fires.
   base::OneShotTimer<TooltipController> tooltip_shown_timer_;
 
   // Location of the last event in |tooltip_window_|'s coordinates.
   gfx::Point curr_mouse_loc_;
 
   bool tooltips_enabled_;
 
   std::map<aura::Window*, int> tooltip_shown_timeout_map_;
 
   DISALLOW_COPY_AND_ASSIGN(TooltipController);
 };
 
 }  // namespace corewm
 }  // namespace views
 
 #endif  // UI_VIEWS_COREWM_TOOLTIP_CONTROLLER_H_