[UserClassifier] Inject a clock

components/ntp_snippets/remote/remote_suggestions_fetcher_unittest.cc

 // Copyright 2016 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/ntp_snippets/remote/remote_suggestions_fetcher.h"
 
 #include <deque>
 #include <map>
 #include <set>
 #include <utility>
 #include <vector>
 
 #include "base/json/json_reader.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/histogram_tester.h"
 #include "base/test/test_mock_time_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "base/time/default_clock.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "components/ntp_snippets/category.h"
 #include "components/ntp_snippets/features.h"
 #include "components/ntp_snippets/ntp_snippets_constants.h"
 #include "components/ntp_snippets/remote/remote_suggestion.h"
 #include "components/ntp_snippets/remote/request_params.h"
 #include "components/ntp_snippets/remote/test_utils.h"
 #include "components/ntp_snippets/user_classifier.h"
 #include "components/prefs/testing_pref_service.h"
@@ skipping 244 matching lines @@
   explicit RemoteSuggestionsFetcherTestBase(const GURL& gurl)
       : default_variation_params_(
             {{"send_top_languages", "true"}, {"send_user_class", "true"}}),
         params_manager_(ntp_snippets::kStudyName,
                         default_variation_params_,
                         {ntp_snippets::kArticleSuggestionsFeature.name}),
         mock_task_runner_(new base::TestMockTimeTaskRunner()),
         mock_task_runner_handle_(mock_task_runner_),
         test_url_(gurl) {
     UserClassifier::RegisterProfilePrefs(utils_.pref_service()->registry());
-    user_classifier_ = base::MakeUnique<UserClassifier>(utils_.pref_service());
+    user_classifier_ = base::MakeUnique<UserClassifier>(
+        utils_.pref_service(), base::MakeUnique<base::DefaultClock>());
     // Increase initial time such that ticks are non-zero.
     mock_task_runner_->FastForwardBy(base::TimeDelta::FromMilliseconds(1234));
     ResetFetcher();
   }
 
   void ResetFetcher() { ResetFetcherWithAPIKey(kAPIKey); }
 
   void ResetFetcherWithAPIKey(const std::string& api_key) {
     scoped_refptr<net::TestURLRequestContextGetter> request_context_getter =
         new net::TestURLRequestContextGetter(mock_task_runner_.get());
@@ skipping 740 matching lines @@
         fetched_categories) {
   if (fetched_categories) {
     // Matchers above aren't any more precise than this, so this is sufficient
     // for test-failure diagnostics.
     return os << "list with " << fetched_categories->size() << " elements";
   }
   return os << "null";
 }
 
 }  // namespace ntp_snippets