Block the disable option for WebView Default package

Test: atest ApplicationFeatureProviderImplTest

Bug: 308907090

Change-Id: I21785975b965b04895849d2df71fa2f2b4cb4b2d

src/com/android/settings/webview/WebViewUpdateServiceWrapper.java

@@ -22,11 +22,14 @@ import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.os.RemoteException;
 import android.util.Log;
+import android.webkit.IWebViewUpdateService;
 import android.webkit.UserPackage;
 import android.webkit.WebViewFactory;
 import android.webkit.WebViewProviderInfo;
 import android.widget.Toast;
 
+import androidx.annotation.Nullable;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -104,5 +107,24 @@ public class WebViewUpdateServiceWrapper {
         toast.show();
     }
 
+    /**
+     * Fetch the package name of the default WebView provider.
+     */
+    @Nullable
+    public String getDefaultWebViewPackageName() {
+        try {
+            IWebViewUpdateService service = WebViewFactory.getUpdateService();
+            if (service != null) {
+                WebViewProviderInfo provider = service.getDefaultWebViewPackage();
+                if (provider != null) {
+                    return provider.packageName;
+                }
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "RemoteException when trying to fetch default WebView package Name", e);
+        }
+        return null;
+    }
+
     static final int PACKAGE_FLAGS = PackageManager.MATCH_ANY_USER;
 }