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

tools/testing/dart/test_runner.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Classes and methods for executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 1085 matching lines @@
       bool compilationSkipped)
       : _infraFailure =
             _failedBecauseOfFlakyInfrastructure(command, timedOut, stderr),
         super(command, exitCode, timedOut, stdout, stderr, time,
             compilationSkipped, 0);
 
   Expectation result(TestCase testCase) {
     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;
     if (hasNonUtf8) return Expectation.nonUtf8Error;
 
     var outcome = _getOutcome();
 
     if (testCase.hasRuntimeError) {
       if (!outcome.canBeOutcomeOf(Expectation.runtimeError)) {
         return Expectation.missingRuntimeError;
@@ skipping 2112 matching lines @@
     }
   }
 
   void eventAllTestsDone() {
     for (var listener in _eventListener) {
       listener.allDone();
     }
     _allDone();
   }
 }