Update checked-in binary to 0.6.21.3_r26639 (M6)

dart/tools/testing/dart/utils.dart

Index: dart/tools/testing/dart/utils.dart
diff --git a/dart/tools/testing/dart/utils.dart b/dart/tools/testing/dart/utils.dart
index 888f8cfc7a8bf9139289f2863679fccb60b9d077..51109e5351d7d7c5c7f73f7867f7f3769c4d0d3e 100644
--- a/dart/tools/testing/dart/utils.dart
+++ b/dart/tools/testing/dart/utils.dart
@@ -4,10 +4,13 @@
 
 library utils;
 
-import 'dart:io';
 import 'dart:async';
+import 'dart:io';
+import 'dart:math' show min;
 import 'dart:utf' as utf;
 
+part 'legacy_path.dart';
+
 class DebugLogger {
   static IOSink _sink;
 
@@ -17,7 +20,7 @@ class DebugLogger {
   static init(Path path, {append: false}) {
     if (path != null) {
       var mode = append ? FileMode.APPEND : FileMode.WRITE;
-      _sink = new File.fromPath(path).openWrite(mode: mode);
+      _sink = new File(path.toNativePath()).openWrite(mode: mode);
     }
   }
 
@@ -151,4 +154,4 @@ class UniqueObject {
   operator==(other) => other is UniqueObject && _hashCode == other._hashCode;
 
   UniqueObject() : _hashCode = ++_nextId;
-}
+}