Integrate PerUserStateManager logic to metrics upload permissions.

I added a base integration test for now but will be adding more in
follow-up CLs.

Bug: 1181504
Change-Id: I102a7d5f150efba2dde22fd5d3dbe37c83064516
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3243810
Reviewed-by: Alexei Svitkine <[email protected]>
Reviewed-by: Gabriel Charette <[email protected]>
Commit-Queue: Jong Ahn <[email protected]>
Cr-Commit-Position: refs/heads/main@{#960211}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 9a4e298..5c340b68 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -1422,6 +1422,7 @@
   chromeos::settings::OSSettingsUI::RegisterProfilePrefs(registry);
   ash::StartupUtils::RegisterOobeProfilePrefs(registry);
   ash::UserImageSyncObserver::RegisterProfilePrefs(registry);
+  ChromeMetricsServiceClient::RegisterProfilePrefs(registry);
   crostini::prefs::RegisterProfilePrefs(registry);
   ash::attestation::TpmChallengeKey::RegisterProfilePrefs(registry);
   flags_ui::PrefServiceFlagsStorage::RegisterProfilePrefs(registry);