Changes to how we handle fancy stacks:

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
===================================================================
--- tools/testing/dart/test_suite.dart	(revision 26163)
+++ tools/testing/dart/test_suite.dart	(working copy)
@@ -966,13 +966,15 @@
       Path expectedOutput = null;
       if (new File.fromPath(pngPath).existsSync()) {
         expectedOutput = pngPath;
-        content = getHtmlLayoutContents(scriptType, new Path("$scriptPath"));
+        content = getHtmlLayoutContents(scriptType, new Path("$scriptPath"),
+            configuration['fancy_stacks']);
       } else if (new File.fromPath(txtPath).existsSync()) {
         expectedOutput = txtPath;
-        content = getHtmlLayoutContents(scriptType, new Path("$scriptPath"));
+        content = getHtmlLayoutContents(scriptType, new Path("$scriptPath"),
+          configuration['fancy_stacks']);
       } else {
         content = getHtmlContents(filename, scriptType,
-            new Path("$scriptPath"));
+            new Path("$scriptPath"), configuration['fancy_stacks']);
       }
       htmlTest.writeStringSync(content);
       htmlTest.closeSync();
@@ -1237,6 +1239,10 @@
       }
       args.addAll(dartOptions);
     }
+    // Turn off fancy stacks.
+    if (!configuration['fancy_stacks']) {
+      args.add('--no-fancy-stacks');
+    }
 
     return args;
   }