fix an issue where the refresh benchmark would overwrite a completer (#4315)

bc5d4074 · Devon Carew · 6d4fd850 · bc5d4074
Commit bc5d4074 authored Jun 02, 2016 by Devon Carew
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observatory.dart packages/flutter_tools/lib/src/observatory.dart +1 -1

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--- a/packages/flutter_tools/lib/src/observatory.dart
+++ b/packages/flutter_tools/lib/src/observatory.dart
@@ -83,7 +83,7 @@ class Observatory {
    if (isolates.isNotEmpty)
      return isolates.first;

-    _waitFirstIsolateCompleter = new Completer<IsolateRef>();
+    _waitFirstIsolateCompleter ??= new Completer<IsolateRef>();

    getVM().then((VM vm) {
      for (IsolateRef isolate in vm.isolates)