Make <a ping> work for context menus.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index da8764dbd27f16a866ba6edb3feddd1c2e3fd6b9..0e2fee2e2634c5f786f36790a681ff8f5a005dfc 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -53,6 +53,7 @@
 #include "content/renderer/context_menu_params_builder.h"
 #include "content/renderer/devtools/devtools_agent.h"
 #include "content/renderer/dom_automation_controller.h"
+#include "content/renderer/dom_utils.h"
 #include "content/renderer/geolocation_dispatcher.h"
 #include "content/renderer/history_controller.h"
 #include "content/renderer/history_serialization.h"
@@ -1029,6 +1030,11 @@ void RenderFrameImpl::OnContextMenuClosed(
       pending_context_menus_.Remove(custom_context.request_id);
     }
   } else {
+    if (custom_context.link_followed.is_valid()) {
+        frame_->sendPings(
+            DomUtils::ExtractParentAnchorNode(context_menu_node_),
+            custom_context.link_followed);
+    }
     // Internal request, forward to WebKit.
     context_menu_node_.reset();
   }