Fix ddc isolate patch (which broke at 4ccae238)

This was unfortunately not detected by the bots:

  * First because of #37117 this didn't break the build.

  * Second, because of how I am migrating modular_test to use the test matrix,
    we are temporarily not seeing failures either.

    I had the intention to wait to land my changes until after the test
    infrastructure had support to report the status of individual modular tests.
    I landed what I thought was safe to land first, but didn't realize that my
    first change already was hiding failures. Now I decided to move forward to
    land the rest of my changes, so the only thing that remains is to wait for
    the test infrastructure changes to land (ETA: very soon, a CL is already
    approved).

TBR=vsm@google.com

Change-Id: Ia06f4ce9bc5d9368fc36a88f9c9ce5530e42c983
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/105404
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Vijay Menon <vsm@google.com>
Commit-Queue: Sigmund Cherem <sigmund@google.com>
diff --git a/sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart b/sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart
index f3b2d12..f6aa73bb 100644
--- a/sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart
+++ b/sdk/lib/_internal/js_dev_runtime/patch/isolate_patch.dart
@@ -6,6 +6,7 @@
 
 import 'dart:_js_helper' show patch, NoReifyGeneric;
 import 'dart:async';
+import "dart:typed_data" show TypedData;
 
 @patch
 class Isolate {