Add support for catching rendere crashes in drt

tools/testing/dart/test_runner.dart

Index: tools/testing/dart/test_runner.dart
===================================================================
--- tools/testing/dart/test_runner.dart	(revision 28442)
+++ tools/testing/dart/test_runner.dart	(working copy)
@@ -817,6 +817,10 @@
     return super.canRunDependendCommands && !didFail(null);
   }
 
+  bool get hasCrashed {
+    return super.hasCrashed || _rendererCrashed;
+  }
+
   Expectation _getOutcome() {
     if (_failedBecauseOfMissingXDisplay) {
       return Expectation.FAIL;
@@ -852,6 +856,9 @@
     return false;
   }
 
+  bool get _rendererCrashed =>
+      decodeUtf8(super.stdout).contains("#CRASHED - rendere");
+
   bool get _failedBecauseOfUnexpectedDRTOutput {
     /*
      * The output of content shell is different for pixel tests than for