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

ui/views/corewm/tooltip.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_H_
 #define UI_VIEWS_COREWM_TOOLTIP_H_
 
 #include "base/strings/string16.h"
 #include "ui/views/views_export.h"
 
 namespace aura {
 class Window;
 }
 
 namespace gfx {
 class Point;
 }
 
+namespace test {
+  class TooltipControllerTestHelper;
+}  // namespace test
+
 namespace views {
 namespace corewm {
 
 // Tooltip is responsible for showing the tooltip in an appropriate manner.
 // Tooltip is used by TooltipController.
 class VIEWS_EXPORT Tooltip {
  public:
   virtual ~Tooltip() {}
 
   // Updates the text on the tooltip and resizes to fit.
   virtual void SetText(aura::Window* window,
                        const base::string16& tooltip_text,
                        const gfx::Point& location) = 0;
 
   // Shows the tooltip at the specified location (in screen coordinates).
   virtual void Show() = 0;
 
   // Hides the tooltip.
   virtual void Hide() = 0;
 
   // Is the tooltip visibile?
   virtual bool IsVisible() = 0;
+
+ private:
+  friend class test::TooltipControllerTestHelper;
+
+  virtual gfx::Point GetTooltipPosition() = 0;

[sky, 2014/04/10 16:12:08]

You shouldn't have to expose this to test the fix. You should be able to change
TestTooltip to cache the location.

 };
 
 }  // namespace corewm
 }  // namespace views
 
 #endif  // UI_VIEWS_COREWM_TOOLTIP_H_