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

ui/wm/public/tooltip_client.h

Index: ui/wm/public/tooltip_client.h
diff --git a/ui/wm/public/tooltip_client.h b/ui/wm/public/tooltip_client.h
index f592b21a18a5ef4072a3e139907419e4c4340366..f2b97cdd0f4e70acccdaf8065503ae746dafec46 100644
--- a/ui/wm/public/tooltip_client.h
+++ b/ui/wm/public/tooltip_client.h
@@ -36,8 +36,14 @@ 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 SetTooltipId(Window* window, void* id);
 AURA_EXPORT const base::string16 GetTooltipText(Window* window);
+AURA_EXPORT const void* GetTooltipId(Window* window);
 
 }  // namespace client
 }  // namespace aura