Accessible bounds should include device scale factor on Windows.

content/browser/accessibility/browser_accessibility.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 CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 146 matching lines @@
   // role is WebAXRoleStaticText.
   gfx::Rect GetPageBoundsForRange(int start, int len) const;
 
   // Same as |GetPageBoundsForRange| but in screen coordinates.
   gfx::Rect GetScreenBoundsForRange(int start, int len) const;
 
   // Convert a bounding rectangle from this node's coordinate system
   // (which is relative to its nearest scrollable ancestor) to
   // absolute bounds, either in page coordinates (when |frameOnly| is
   // false), or in frame coordinates (when |frameOnly| is true).
-  gfx::Rect RelativeToAbsoluteBounds(gfx::RectF bounds, bool frame_only) const;
+  virtual gfx::Rect RelativeToAbsoluteBounds(gfx::RectF bounds,
+                                             bool frame_only) const;
 
   // This is to handle the cases such as ARIA textbox, where the value should
   // be calculated from the object's inner text.
   virtual base::string16 GetValue() const;
 
   // Starting at the given character offset, locates the start of the next or
   // previous line and returns its character offset.
   int GetLineStartBoundary(int start,
                            ui::TextBoundaryDirection direction,
                            ui::AXTextAffinity affinity) const;
@@ skipping 213 matching lines @@
   // bounds, but "virtual" elements in the accessibility tree that don't
   // correspond to a layed-out element sometimes don't have bounds.
   void FixEmptyBounds(gfx::RectF* bounds) const;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_