fix: exposes a new ManagedChannelProvider.newChannelBuilder with NameResolverRegistry and NameResolverProvider.

Author: AgraVator

api/src/main/java/io/grpc/ManagedChannelProvider.java

@@ -81,6 +81,16 @@ protected NewChannelBuilderResult newChannelBuilder(String target, ChannelCreden
     return NewChannelBuilderResult.error("ChannelCredentials are unsupported");
   }
 
+  /**
+   * Creates a channel builder with a target string, credentials, NameResolverRegistry adn NameResolverProvider.
+   * Returns an error-string result if unable to understand the credentials.
+   */
+  protected NewChannelBuilderResult newChannelBuilder(String target, ChannelCredentials creds,
+                                                      NameResolverRegistry nameResolverRegistry,
+                                                      NameResolverProvider nameResolverProvider) {
+    return newChannelBuilder(target, creds);
+  }
+
   /**
    * Returns the {@link SocketAddress} types this ManagedChannelProvider supports.
    */