Add AddCallbackForCookie method to CookieStore.

chrome/browser/prerender/prerender_cookie_store.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/prerender/prerender_cookie_store.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "content/public/browser/browser_thread.h"
 
@@ skipping 215 matching lines @@
   // special to prevent this race condition.
   cookie_conflict_ = true;
   if (!cookie_conflict_cb_.is_null()) {
     BrowserThread::PostTask(
         BrowserThread::UI,
         FROM_HERE,
         cookie_conflict_cb_);
   }
 }
 
+scoped_ptr<CookieStore::CookieChangedSubscription>
+PrerenderCookieStore::AddCallbackForCookie(
+    const GURL& url,
+    const std::string& name,
+    const CookieChangedCallback& callback) {
+  // Unimplemented.
+  // TODO(ellyjones): implement?

[erikwright (departed), 2014/10/24 20:11:10]

use "NOTIMPLEMENTED();" from base/logging.h so that we catch any unexpected
usage of this.

+  return scoped_ptr<CookieChangedSubscription>();
+}
+
 PrerenderCookieStore::CookieOperation::CookieOperation() {
 }
 
 PrerenderCookieStore::CookieOperation::~CookieOperation() {
 }
 
 }  // namespace prerender