Add History.TopHostsVisitsByRank UMA metric.

components/history/core/browser/url_utils_unittest.cc

 // Copyright 2013 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 "components/history/core/browser/url_utils.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
 namespace history {
@@ skipping 108 matching lines @@
 
 TEST(HistoryUrlUtilsTest, ToggleHTTPAndHTTPS) {
   EXPECT_EQ(GURL("http://www.google.com/test?q#r"),
             ToggleHTTPAndHTTPS(GURL("https://www.google.com/test?q#r")));
   EXPECT_EQ(GURL("https://www.google.com:137/"),
             ToggleHTTPAndHTTPS(GURL("http://www.google.com:137/")));
   EXPECT_EQ(GURL::EmptyGURL(),
             ToggleHTTPAndHTTPS(GURL("ftp://www.google.com/")));
 }
 
+TEST(HistoryUrlUtilsTest, HostForTopHosts) {
+  EXPECT_EQ("foo.com", HostForTopHosts(GURL("https://foo.com/bar")));
+  EXPECT_EQ("foo.com", HostForTopHosts(GURL("http://foo.com:999/bar")));
+  EXPECT_EQ("foo.com", HostForTopHosts(GURL("http://www.foo.com/bar")));
+  EXPECT_EQ("foo.com", HostForTopHosts(GURL("HtTP://WWw.FoO.cOM/BAR")));
+}
+
 }  // namespace
 
 }  // namespace history