Support for pixel layout tests.

utils/testrunner/utils.dart

Index: utils/testrunner/utils.dart
===================================================================
--- utils/testrunner/utils.dart	(revision 12392)
+++ utils/testrunner/utils.dart	(working copy)
@@ -99,16 +99,4 @@
 void deleteFile(String fname) {
   var f = new File(fname);
   f.deleteSync();
-}
-
-/** Get the name of the layout render file for a test. */
-String layoutFileName(String testname) =>
-  testname.replaceAll(new RegExp('\.dart\$'), '.render');
-
-/** 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();
-}
+}