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 be216fcf2079c0fce49c8aa56e465bd6e4129126..dc3afb91a787ec596f64ab149d74b411290901e6 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -80,6 +80,7 @@
 #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"
@@ -475,6 +476,7 @@ 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);