Support for pixel layout tests.

utils/testrunner/utils.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.
 
 /**
  * Read the contents of a file [fileName] into a [List] of [String]s.
  * If the file does not exist and [errorIfNoFile] is true, throw an
  * exception, else return an empty list.
  */
 List<String> getFileContents(String filename, bool errorIfNoFile) {
@@ skipping 78 matching lines @@
         print('$path does not exist.');
       }
     }
   }
   if (--dirCount == 0) {
     onComplete(files);
   }
 }
 
 /** Delete a file. */
-void deleteFile(String fname) {
+bool deleteFile(String fname) {
   var f = new File(fname);
-  f.deleteSync();
+  try {
+    f.deleteSync();
+  } catch (e) {
+    return false;
+  }
+  return true;
 }
 
-/** Get the name of the layout render file for a test. */
-String layoutFileName(String testname) =>
-  testname.replaceAll(new RegExp('\.dart\$'), '.render');
+/**
+ * Get the directory that testrunner lives in; we need it to import
+ * support files into the generated scripts.
+ */
 
-/** Check if a test is a layout render test. renders.
- */
-bool isLayoutRenderTest(String testname) {
-  var layoutname = layoutFileName(testname);
-  var f = new File(layoutname);
-  return f.existsSync();
+String get runnerDirectory() {
+  var libDirectory = makePathAbsolute(new Options().script);
+  return libDirectory.substring(0,
+      libDirectory.lastIndexOf(Platform.pathSeparator));
 }
+