[Privacy Sandbox] Add additional pref, add OWNERS

Add an additional pref to indicate whether the device in question
has the privacy sandbox settings UI available.

Modify the 2 existing prefs to be syncing.

Create an OWNERS file for chrome/browser/privacy_sandbox, and add some
members of the chrome friendly settings team to it.

Bug: 1152336
Change-Id: Ie39a763a703fc2c2ee092d14513fca31784037ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2565572Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Sean Harrison <harrisonsean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832294}

chrome/browser/privacy_sandbox/OWNERS

+andzaytsev@google.com
+harrisonsean@chromium.org
+msramek@chromium.org
+sauski@google.com
+
+# COMPONENT: UI>Settings>Privacy
+# TEAM: chrome-friendly-settings@google.com

chrome/browser/privacy_sandbox/privacy_sandbox_prefs.cc

@@ -13,16 +13,23 @@ namespace prefs {
 
 const char kPrivacySandboxApisEnabled[] = "privacy_sandbox.apis_enabled";
 
-const char kPrivacySandboxManauallyControlled[] =
+const char kPrivacySandboxManuallyControlled[] =
     "privacy_sandbox.manually_controlled";
 
+const char kPrivacySandboxUiAvailable[] = "privacy_sandbox.ui_available";
+
 }  // namespace prefs
 
 namespace privacy_sandbox {
 
 void RegisterProfilePrefs(PrefRegistrySimple* registry) {
-  registry->RegisterBooleanPref(prefs::kPrivacySandboxApisEnabled, false);
-  registry->RegisterBooleanPref(prefs::kPrivacySandboxManauallyControlled,
-                                false);
+  registry->RegisterBooleanPref(
+      prefs::kPrivacySandboxApisEnabled, false,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+  registry->RegisterBooleanPref(
+      prefs::kPrivacySandboxManuallyControlled, false,
+      user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+  registry->RegisterBooleanPref(prefs::kPrivacySandboxUiAvailable, false);
 }
+
 }  // namespace privacy_sandbox

chrome/browser/privacy_sandbox/privacy_sandbox_prefs.h

@@ -5,19 +5,23 @@
 #ifndef CHROME_BROWSER_PRIVACY_SANDBOX_PRIVACY_SANDBOX_PREFS_H_
 #define CHROME_BROWSER_PRIVACY_SANDBOX_PRIVACY_SANDBOX_PREFS_H_
 
-#include "components/prefs/pref_registry_simple.h"
+class PrefRegistrySimple;
 
 namespace prefs {
 
-// Boolean that is true when Privacy Sandbox APIs are enabled. If the
+// Synced boolean that is true when Privacy Sandbox APIs are enabled. If the
 // PrivacySandboxSettings feature is enabled, this Boolean is controlled by the
 // associated UI; if it is disabled, it is controlled by third party cookie
 // blocking settings.
 extern const char kPrivacySandboxApisEnabled[];
 
-// Boolean that indicates if a user has manually toggled the settings associated
-// with the PrivacySandboxSettings feature.
-extern const char kPrivacySandboxManauallyControlled[];
+// Synced boolean that indicates if a user has manually toggled the settings
+// associated with the PrivacySandboxSettings feature.
+extern const char kPrivacySandboxManuallyControlled[];
+
+// Boolean to indicate whether or not the UI for Privacy Sandbox settings has
+// been made available on the device.
+extern const char kPrivacySandboxUiAvailable[];
 
 }  // namespace prefs