Ignore exit-code of DRT and only trust stdout

tools/testing/dart/test_runner.dart

Index: tools/testing/dart/test_runner.dart
diff --git a/tools/testing/dart/test_runner.dart b/tools/testing/dart/test_runner.dart
index aa9980a5d1b7f48555816a12d43064349da6c23b..b864d414fe21e3fe05ef9778e37ae31c1cf3b58c 100644
--- a/tools/testing/dart/test_runner.dart
+++ b/tools/testing/dart/test_runner.dart
@@ -707,7 +707,13 @@ class BrowserCommandOutputImpl extends CommandOutputImpl {
               print("Warning: All tests passed, but exitCode != 0 "
                     "(${testCase.displayName})");
             }
-            return (exitCode != 0 && !hasCrashed);
+            if (testCase.configuration['runtime'] == 'drt') {
+              // TODO(kustermann/ricow): Issue: 7563
+              // We should eventually get rid of this hack.
+              return false;
+            } else {
+              return (exitCode != 0 && !hasCrashed);
+            }
           }
           break;
       }