Measure usage metrics to prepare for adaptive fetching rates in M55

components/ntp_snippets/content_suggestions_service.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/content_suggestions_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
+#include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "ui/gfx/image/image.h"
 
 namespace ntp_snippets {
 
 ContentSuggestionsService::ContentSuggestionsService(
     State state,
-    history::HistoryService* history_service)
-    : state_(state), history_service_observer_(this) {
+    history::HistoryService* history_service,
+    PrefService* pref_service)
+    : state_(state),
+      history_service_observer_(this),
+      user_classifier_(pref_service) {
   // Can be null in tests.
   if (history_service)
     history_service_observer_.Add(history_service);
 }
 
 ContentSuggestionsService::~ContentSuggestionsService() {}
 
 void ContentSuggestionsService::Shutdown() {
   ntp_snippets_service_ = nullptr;
   id_category_map_.clear();
@@ skipping 312 matching lines @@
           if (left.IsKnownCategory(KnownCategories::BOOKMARKS))
             return false;
           if (right.IsKnownCategory(KnownCategories::BOOKMARKS))
             return true;
         }
         return category_factory_.CompareCategories(left, right);
       });
 }
 
 }  // namespace ntp_snippets