New API to test table headers at specified index.

content/shell/renderer/test_runner/web_ax_object_proxy.h

Index: content/shell/renderer/test_runner/web_ax_object_proxy.h
diff --git a/content/shell/renderer/test_runner/web_ax_object_proxy.h b/content/shell/renderer/test_runner/web_ax_object_proxy.h
index a7abc325c96a09735a42c71e92ff5ba2c1b738c0..6c734b688c4475bd744e3c7fd173945d067444bb 100644
--- a/content/shell/renderer/test_runner/web_ax_object_proxy.h
+++ b/content/shell/renderer/test_runner/web_ax_object_proxy.h
@@ -106,6 +106,8 @@ class WebAXObjectProxy : public gin::Wrappable<WebAXObjectProxy> {
   v8::Handle<v8::Object> ChildAtIndex(int index);
   v8::Handle<v8::Object> ElementAtPoint(int x, int y);
   v8::Handle<v8::Object> TableHeader();
+  v8::Handle<v8::Object> RowHeaderAtIndex(unsigned index);
+  v8::Handle<v8::Object> ColumnHeaderAtIndex(unsigned index);
   std::string RowIndexRange();
   std::string ColumnIndexRange();
   v8::Handle<v8::Object> CellForColumnAndRow(int column, int row);