Add a helper function and update test results with ax role of table header.

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 223 matching lines @@
   // aria-expanded  (expandable)
   // aria-pressed   (toggleable/pressable) -- supports 4th "mixed" state
   // aria-checked   (checkable) -- supports 4th "mixed state"
   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 cell or an table header.
+  bool IsCellOrTableHeaderRole() 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:
@@ skipping 12 matching lines @@
 
   std::string name_;
   std::string value_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_