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

ui/wm/public/tooltip_client.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_WM_PUBLIC_TOOLTIP_CLIENT_H_
 #define UI_WM_PUBLIC_TOOLTIP_CLIENT_H_
 
 #include "ui/aura/aura_export.h"
 #include "ui/gfx/font.h"
 
@@ skipping 18 matching lines @@
   virtual void SetTooltipsEnabled(bool enable) = 0;
 
  private:
   friend class ScopedTooltipDisabler;
 };
 
 AURA_EXPORT void SetTooltipClient(Window* root_window,
                                   TooltipClient* client);
 AURA_EXPORT TooltipClient* GetTooltipClient(Window* root_window);
 
-AURA_EXPORT void SetTooltipText(Window* window, base::string16* tooltip_text);
+// Sets the text for the tooltip. The id is used to determine uniqueness when
+// the text does not change. For example, if the tooltip text does not change,
+// but the id does then the position of the tooltip is updated.
+AURA_EXPORT void SetTooltipText(Window* window,
+                                base::string16* tooltip_text);
+AURA_EXPORT void UpdateTooltipId(Window* window, void* id);

[sky, 2014/06/04 15:32:53]

UpdateTooltipId->SetTooltipId

 AURA_EXPORT const base::string16 GetTooltipText(Window* window);
+AURA_EXPORT const void* GetTooltipId(Window* window);
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_WM_PUBLIC_TOOLTIP_CLIENT_H_