Fix accessibility objects with zero width and height.

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 265 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;
 
+  // If a bounding rectangle is empty, compute it based on the union of its
+  // children, since most accessibility APIs don't like elements with no
+  // 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::Rect* bounds) 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_