Accessibility BoundsForRange needs to take scroll offsets into account.

content/browser/accessibility/browser_accessibility.h

Index: content/browser/accessibility/browser_accessibility.h
diff --git a/content/browser/accessibility/browser_accessibility.h b/content/browser/accessibility/browser_accessibility.h
index e8a7d387d31407d42f3304e4591caa2f4b98c383..7db0a2b3c82088fc70102e753f1cbb239908809c 100644
--- a/content/browser/accessibility/browser_accessibility.h
+++ b/content/browser/accessibility/browser_accessibility.h
@@ -273,6 +273,11 @@ class CONTENT_EXPORT BrowserAccessibility {
   // 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);
 };