Support presentational iframes and make use of them in the uber frame.

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 226 matching lines @@
   bool GetAriaTristate(const char* attr_name,
                        bool* is_defined,
                        bool* is_mixed) const;
 
   // Returns true if the bit corresponding to the given state enum is 1.
   bool HasState(ui::AXState state_enum) const;
 
   // Returns true if this node is an editable text field of any kind.
   bool IsEditableText() const;
 
+  // True if this is a web area, and its grandparent is a presentational iframe.
+  bool IsWebAreaForPresentationalIframe() const;
+
   // Append the text from this node and its children.
   std::string GetTextRecursive() const;
 
  protected:
   BrowserAccessibility();
 
   // The manager of this tree of accessibility objects.
   BrowserAccessibilityManager* manager_;
 
   // The underlying node.
   ui::AXNode* node_;
 
  private:
   // Return the sum of the lengths of all static text descendants,
   // including this object if it's static text.
   int GetStaticTextLenRecursive() const;
 
   std::string name_;
   std::string value_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_