Report ie11 timeouts in debug log, not as errors (attempt 2)

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 e514301a8d787704cd605eb381c58ffaa0d657c2..69702006b548a0048b9e44d177b3ba3127f4b805 100644
--- a/tools/testing/dart/test_runner.dart
+++ b/tools/testing/dart/test_runner.dart
@@ -1103,7 +1103,13 @@ class BrowserCommandOutputImpl extends CommandOutputImpl {
     if (_infraFailure) {
       return Expectation.ignore;
     }
-
+    // TODO(28955): See http://dartbug.com/28955
+    // The code for this in _failedBecauseOfFlakyInfrastructure doesn't
+    // seem to be working.
+    if (hasTimedOut && testCase.configuration.runtime == Runtime.ie11) {
+      DebugLogger.warning("Timeout of ie11 on test ${testCase.displayName}");
+      return Expectation.ignore;
+    }
     // Handle crashes and timeouts first
     if (hasCrashed) return Expectation.crash;
     if (hasTimedOut) return Expectation.timeout;