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

content/public/common/referrer.cc

Index: content/public/common/referrer.cc
diff --git a/content/public/common/referrer.cc b/content/public/common/referrer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..23e21ceeda601effae162f6c99cf2c79dde98e8e
--- /dev/null
+++ b/content/public/common/referrer.cc
@@ -0,0 +1,21 @@
+// 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 "content/public/common/referrer.h"
+
+using WebKit::WebReferrerPolicy;
+
+namespace content {
+
+Referrer::Referrer(const GURL& url,
+                   WebReferrerPolicy policy)
+    : url(url),
+      policy(policy) {
+}
+
+Referrer::Referrer()
+    : policy(WebKit::WebReferrerPolicyDefault) {
+}
+
+}  // namespace