Provides API for testing number of table headers.

content/shell/renderer/test_runner/web_ax_object_proxy.cc

Index: content/shell/renderer/test_runner/web_ax_object_proxy.cc
diff --git a/content/shell/renderer/test_runner/web_ax_object_proxy.cc b/content/shell/renderer/test_runner/web_ax_object_proxy.cc
index 2f12d70fd9ffeb6ff41432f45e2ca35248095cf5..4d886c60591b74b54384fe6d87f4d6a9f5f63ed6 100644
--- a/content/shell/renderer/test_runner/web_ax_object_proxy.cc
+++ b/content/shell/renderer/test_runner/web_ax_object_proxy.cc
@@ -509,7 +509,9 @@ WebAXObjectProxy::GetObjectTemplateBuilder(v8::Isolate* isolate) {
       .SetProperty("clickPointX", &WebAXObjectProxy::ClickPointX)
       .SetProperty("clickPointY", &WebAXObjectProxy::ClickPointY)
       .SetProperty("rowCount", &WebAXObjectProxy::RowCount)
+      .SetProperty("rowHeadersCount", &WebAXObjectProxy::RowHeadersCount)
       .SetProperty("columnCount", &WebAXObjectProxy::ColumnCount)
+      .SetProperty("columnHeadersCount", &WebAXObjectProxy::ColumnHeadersCount)
       .SetProperty("isClickable", &WebAXObjectProxy::IsClickable)
       .SetProperty("isButtonStateMixed", &WebAXObjectProxy::IsButtonStateMixed)
       .SetMethod("allAttributes", &WebAXObjectProxy::AllAttributes)
@@ -809,11 +811,26 @@ int32_t WebAXObjectProxy::RowCount() {
   return static_cast<int32_t>(accessibility_object_.rowCount());
 }
 
+int32_t WebAXObjectProxy::RowHeadersCount() {
+  accessibility_object_.updateLayoutAndCheckValidity();
+  blink::WebVector<blink::WebAXObject> headers;
+  accessibility_object_.rowHeaders(headers);
+  return static_cast<int32_t>(headers.size());
+}
+
 int32_t WebAXObjectProxy::ColumnCount() {
   accessibility_object_.updateLayoutAndCheckValidity();
   return static_cast<int32_t>(accessibility_object_.columnCount());
 }
 
+int32_t WebAXObjectProxy::ColumnHeadersCount()
+{
+  accessibility_object_.updateLayoutAndCheckValidity();
+  blink::WebVector<blink::WebAXObject> headers;
+  accessibility_object_.columnHeaders(headers);
+  return static_cast<int32_t>(headers.size());
+}
+
 bool WebAXObjectProxy::IsClickable() {
   accessibility_object_.updateLayoutAndCheckValidity();
   return accessibility_object_.isClickable();