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

content/common/referrer_unittest.cc

+// 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 "testing/gtest/include/gtest/gtest.h"
+
+#include "content/public/common/referrer.h"
+
+namespace {
+
+const char* kTestURL = "http://google.com/";
+
+// Check that copying Referrer objects works.
+TEST(ReferrerTest, Copy) {
+  content::Referrer r1(GURL(kTestURL), WebKit::WebReferrerPolicyAlways);
+  content::Referrer r2;
+
+  r2 = r1;
+  EXPECT_EQ(GURL(kTestURL), r2.url());
+  EXPECT_EQ(WebKit::WebReferrerPolicyAlways, r2.policy());
+}
+
+}  // namespace