Make <a ping> work for context menus.

chrome/browser/renderer_context_menu/render_view_context_menu.cc

 // Copyright 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 "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 1919 matching lines @@
 
 // Controller functions --------------------------------------------------------
 
 void RenderViewContextMenu::OpenURL(
     const GURL& url, const GURL& referring_url,
     WindowOpenDisposition disposition,
     content::PageTransition transition) {
   content::Referrer referrer(referring_url.GetAsReferrer(),
       params_.referrer_policy);
 
+  if (params_.link_url == url && disposition != OFF_THE_RECORD)
+    params_.custom_context.link_followed = url;

[Nate Chapin, 2014/07/14 19:01:46]

The meat of the change. We set link_followed in certain cases so that the
HTMLAnchorElement in the renderer process gets a chance to send pings. If
link_followed is left invalid, no pings will be sent.

The rule here is:
* A protocol handler might translate the url, or this function could be called
for an image/video context menu (which set a different parameter than link_url).
So, don't give the renderer a chance to ping if the URL wasn't exactly the
link_url that the renderer process provided.
* If this link is being opened off the record, we suppress referrers, so
suppress pings as well. This seems to match the intent of the user in severing
any connections between the referring page and the destination page.

+
   WebContents* new_contents = source_web_contents_->OpenURL(OpenURLParams(
       url, referrer, disposition, transition, false));
   if (!new_contents)
     return;
 
   RetargetingDetails details;
   details.source_web_contents = source_web_contents_;
   details.source_render_frame_id = render_frame_id_;
   details.target_url = url;
   details.target_web_contents = new_contents;
@@ skipping 43 matching lines @@
   source_web_contents_->GetRenderViewHost()->
       ExecuteMediaPlayerActionAtLocation(location, action);
 }
 
 void RenderViewContextMenu::PluginActionAt(
     const gfx::Point& location,
     const WebPluginAction& action) {
   source_web_contents_->GetRenderViewHost()->
       ExecutePluginActionAtLocation(location, action);
 }