Fixed utf8 encoding/decoding issues in the testing scripts

tools/testing/dart/test_progress.dart

Index: tools/testing/dart/test_progress.dart
diff --git a/tools/testing/dart/test_progress.dart b/tools/testing/dart/test_progress.dart
index c74025e8a59461f99eb3535b5944a28786f76dff..cf3642454e05ba63e34d7463c01cb0968165d4f0 100644
--- a/tools/testing/dart/test_progress.dart
+++ b/tools/testing/dart/test_progress.dart
@@ -5,10 +5,11 @@
 library test_progress;
 
 import "dart:io";
+import "http_server.dart" as http_server;
+import "status_file_parser.dart";
 import "test_runner.dart";
 import "test_suite.dart";
-import "status_file_parser.dart";
-import "http_server.dart" as http_server;
+import "utils.dart";
 
 class ProgressIndicator {
   ProgressIndicator(this._startTime, this._printTiming)
@@ -188,13 +189,13 @@ class ProgressIndicator {
         output.add('DRT pixel test failed! stdout is not printed because it '
                    'contains binary data!');
       } else {
-        output.add(new String.fromCharCodes(test.lastCommandOutput.stdout));
+        output.add(decodeUtf8(test.lastCommandOutput.stdout));
       }
     }
     if (!test.lastCommandOutput.stderr.isEmpty) {
       output.add('');
       output.add('stderr:');
-      output.add(new String.fromCharCodes(test.lastCommandOutput.stderr));
+      output.add(decodeUtf8(test.lastCommandOutput.stderr));
     }
     if (test is BrowserTestCase) {
       // Additional command for rerunning the steps locally after the fact.
@@ -336,7 +337,7 @@ class ColorProgressIndicator extends CompactIndicator {
   addColorWrapped(List<int> codes, String string, int color) {
     codes.add(27);
     codes.addAll('[${color}m'.charCodes);
-    codes.addAll(string.charCodes);
+    codes.addAll(encodeUtf8(string));
     codes.add(27);
     codes.addAll('[0m'.charCodes);
   }
@@ -360,7 +361,7 @@ class ColorProgressIndicator extends CompactIndicator {
   String _header(String header) {
     var result = [];
     addColorWrapped(result, header, BOLD);
-    return new String.fromCharCodes(result);
+    return decodeUtf8(result);
   }
 }