Increase the timeout for a failing pub test.

sdk/lib/_internal/pub/test/transformer/dart2js/converts_isolate_entrypoint_in_web_test.dart

Index: sdk/lib/_internal/pub/test/transformer/dart2js/converts_isolate_entrypoint_in_web_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/dart2js/converts_isolate_entrypoint_in_web_test.dart b/sdk/lib/_internal/pub/test/transformer/dart2js/converts_isolate_entrypoint_in_web_test.dart
index 24302733548c72eccaac9ec3aa8917fee84c83c1..087e9f20dd7b407cccfae8a04aab4f9687591b00 100644
--- a/sdk/lib/_internal/pub/test/transformer/dart2js/converts_isolate_entrypoint_in_web_test.dart
+++ b/sdk/lib/_internal/pub/test/transformer/dart2js/converts_isolate_entrypoint_in_web_test.dart
@@ -13,6 +13,10 @@ import '../../serve/utils.dart';
 main() {
   initConfig();
   integration("converts a Dart isolate entrypoint in web to JS", () {
+    // Increase the timeout because dart2js takes a lot longer than usual to
+    // compile isolate entrypoints.
+    currentSchedule.timeout *= 2;
+
     d.dir(appPath, [
       d.appPubspec(),
       d.dir("web", [