Reload an isolate once it is runnable.

runtime/observatory/lib/src/service/object.dart

Index: runtime/observatory/lib/src/service/object.dart
diff --git a/runtime/observatory/lib/src/service/object.dart b/runtime/observatory/lib/src/service/object.dart
index d38933fe6d2d99d83a0aaac84971a9b7ed2c2e6c..a3f962e3af5bfc04b3cc0f1aa9cea6fe2be214e7 100644
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@@ -674,6 +674,11 @@ abstract class VM extends ServiceObjectOwner {
         _isolateCache.remove(isolate.id);
         _buildIsolateList();
       }
+      if (event.kind == ServiceEvent.kIsolateRunnable) {
+        // Force reload once the isolate becomes runnable so that we
+        // update the root library.
+        isolate.reload();
+      }
     }
     var eventStream = _eventStreams[streamId];
     if (eventStream != null) {