Created AttestationPolicyObserver.

chrome/browser/chromeos/settings/device_settings_provider.cc

Index: chrome/browser/chromeos/settings/device_settings_provider.cc
diff --git a/chrome/browser/chromeos/settings/device_settings_provider.cc b/chrome/browser/chromeos/settings/device_settings_provider.cc
index 89fa7a626babfcc7eb8fa0a6adf01f31401289c9..c4623e92dcce8d944a9dcb9c629602252e44bcb6 100644
--- a/chrome/browser/chromeos/settings/device_settings_provider.cc
+++ b/chrome/browser/chromeos/settings/device_settings_provider.cc
@@ -67,6 +67,7 @@ const char* kKnownSettings[] = {
   kStatsReportingPref,
   kSystemTimezonePolicy,
   kStartUpFlags,
+  kDeviceAttestationEnabled,
 };
 
 // Legacy policy file location. Used to detect migration from pre v12 ChromeOS.
@@ -340,6 +341,7 @@ void DeviceSettingsProvider::SetInPolicy() {
     // The remaining settings don't support Set(), since they are not
     // intended to be customizable by the user:
     //   kAppPack
+    //   kDeviceAttestationEnabled
     //   kDeviceOwner
     //   kIdleLogoutTimeout
     //   kIdleLogoutWarningDuration
@@ -615,6 +617,10 @@ void DeviceSettingsProvider::DecodeGenericPolicies(
         kAllowRedeemChromeOsRegistrationOffers,
         !g_browser_process->browser_policy_connector()->IsEnterpriseManaged());
   }
+
+  new_values_cache->SetBoolean(
+      kDeviceAttestationEnabled,
+      policy.attestation_settings().attestation_enabled());
 }
 
 void DeviceSettingsProvider::UpdateValuesCache(