Fix bug in credential manager settings

Crash due to null ServiceInfo when base class getServiceInfo is called. This is because the base serviceInfo is not populated until an update happens.

Bug: 264279975
Test: Build locally

Change-Id: I80b7ad2885dcfa675e2dffffb249ab33b117d77d

services/credentials/java/com/android/server/credentials/CredentialManagerService.java

@@ -247,6 +247,8 @@ public final class CredentialManagerService
             return cancelTransport;
         }
 
+	@SuppressWarnings("GuardedBy") // ErrorProne requires listEnabledProviders
+        // to be guarded by 'service.mLock', which is the same as mLock.
         @Override
         public ICancellationSignal listEnabledProviders(IListEnabledProvidersCallback callback) {
             Log.i(TAG, "listEnabledProviders");
@@ -256,7 +258,7 @@ public final class CredentialManagerService
             runForUser(
                     (service) -> {
                         enabledProviders.add(
-                                service.getServiceInfo().getComponentName().flattenToString());
+                                service.getComponentName().flattenToString());
                     });
 
             // Call the callback.

services/credentials/java/com/android/server/credentials/CredentialManagerServiceImpl.java

@@ -53,6 +53,11 @@ public final class CredentialManagerServiceImpl extends
         }
     }
 
+    @GuardedBy("mLock")
+    public ComponentName getComponentName() {
+        return mInfo.getServiceInfo().getComponentName();
+    }
+
     @Override // from PerUserSystemService
     @GuardedBy("mLock")
     protected ServiceInfo newServiceInfoLocked(@NonNull ComponentName serviceComponent)