Add a referrer class to be used in the browser process whenever passing around referrsr

content/browser/tab_contents/referrer.cc

Index: content/browser/tab_contents/referrer.cc
diff --git a/content/browser/tab_contents/referrer.cc b/content/browser/tab_contents/referrer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f8699c5caddc2755619bfcf5f1ce46d1c9c96458
--- /dev/null
+++ b/content/browser/tab_contents/referrer.cc
@@ -0,0 +1,27 @@
+// Copyright (c) 2011 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 <iostream>
+
+#include "content/browser/tab_contents/referrer.h"
+
+using WebKit::WebReferrerPolicy;
+
+namespace content {
+
+Referrer::Referrer(const GURL& referrer,
+                   WebReferrerPolicy referrer_policy)
+    : referrer_(referrer),
+      referrer_policy_(referrer_policy) {
+}
+
+Referrer::Referrer()
+    : referrer_policy_(WebKit::WebReferrerPolicyDefault) {
+}
+
+std::ostream& operator<<(std::ostream& out, const Referrer& referrer) {
+  return out << referrer.referrer();
+}
+
+}  // namespace