Accessibility BoundsForRange needs to take scroll offsets into account.

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 <map>
 #include <utility>
 #include <vector>
@@ skipping 255 matching lines @@
  private:
   // Return the sum of the lengths of all static text descendants,
   // including this object if it's static text.
   int GetStaticTextLenRecursive() const;
 
   // Similar to GetParent(), but includes nodes that are the host of a
   // subtree rather than skipping over them - because they contain important
   // bounds offsets.
   BrowserAccessibility* GetParentForBoundsCalculation() const;
 
+  // Convert the bounding rectangle of an element (which is relative to
+  // its nearest scrollable ancestor) to local bounds (which are relative
+  // to the top of the web accessibility tree).
+  gfx::Rect ElementBoundsToLocalBounds(gfx::Rect bounds) const;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_