Make <a ping> work for context menus.

content/renderer/dom_utils.cc

+// Copyright (c) 2014 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.
+
+#include "content/renderer/dom_utils.h"
+
+#include "third_party/WebKit/public/web/WebNode.h"
+
+namespace content {
+
+blink::WebNode DomUtils::ExtractParentAnchorNode(
+    const blink::WebNode& node) {
+    blink::WebNode selected_node = node;
+
+    // If there are other embedded tags (like <a ..>Some <b>text</b></a>)
+    // we need to extract the parent <a/> node.
+    while (!selected_node.isLink() && !selected_node.parentNode().isNull())
+      selected_node = selected_node.parentNode();
+    return selected_node.isLink() ? selected_node : blink::WebNode();
+}
+
+}  // namespace content