Measure usage metrics to prepare for adaptive fetching rates in M55

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index c3d1343e23acd082cb2cb20245647e5d065a29b7..17de6141c1f532701a3390fbf9393150792fca91 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -79,6 +79,7 @@
 #include "components/ntp_snippets/bookmarks/bookmark_suggestions_provider.h"
 #include "components/ntp_snippets/ntp_snippets_service.h"
 #include "components/ntp_snippets/request_throttler.h"
+#include "components/ntp_snippets/user_classifier.h"
 #include "components/omnibox/browser/zero_suggest_provider.h"
 #include "components/password_manager/core/browser/password_bubble_experiment.h"
 #include "components/password_manager/core/browser/password_manager.h"
@@ -467,6 +468,7 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   ntp_snippets::BookmarkSuggestionsProvider::RegisterProfilePrefs(registry);
   ntp_snippets::NTPSnippetsService::RegisterProfilePrefs(registry);
   ntp_snippets::RequestThrottler::RegisterProfilePrefs(registry);
+  ntp_snippets::UserClassifier::RegisterProfilePrefs(registry);
   password_bubble_experiment::RegisterPrefs(registry);
   password_manager::PasswordManager::RegisterProfilePrefs(registry);
   PrefProxyConfigTrackerImpl::RegisterProfilePrefs(registry);