Call DumpRenderTree directly from test.dart instead of using the drt-trampoline.py indirection

tools/testing/dart/test_progress.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.
 
 library test_progress;
 
 import "dart:io";
 import "test_runner.dart";
 import "test_suite.dart";
 import "status_file_parser.dart";
@@ skipping 130 matching lines @@
 
   String _header(String header) => header;
 
   void _printFailureOutput(TestCase test) {
     var failureOutput = _buildFailureOutput(test);
     for (var line in failureOutput) {
       print(line);
     }
     _failureSummary.addAll(failureOutput);
   }
-  
+
   List<String> _buildFailureOutput(TestCase test) {
     List<String> output = new List<String>();
     output.add('');
     output.add(_header('FAILED: ${test.configurationString}'
                        ' ${test.displayName}'));
     StringBuffer expected = new StringBuffer();
     expected.add('Expected: ');
     for (var expectation in test.expectedOutcomes) {
       expected.add('$expectation ');
     }
@@ skipping 14 matching lines @@
     if (!test.lastCommandOutput.diagnostics.isEmpty) {
       String prefix = 'diagnostics:';
       for (var s in test.lastCommandOutput.diagnostics) {
         output.add('$prefix ${s}');
         prefix = '   ';
       }
     }
     if (!test.lastCommandOutput.stdout.isEmpty) {
       output.add('');
       output.add('stdout:');
-      for (var s in test.lastCommandOutput.stdout) {
-        output.add(s);
+      if (test.lastCommandOutput.command.isPixelTest) {
+        output.add('DRT pixel test failed! stdout is not printed because it '
+                   'contains binary data!');
+      } else {
+        output.add(new String.fromCharCodes(test.lastCommandOutput.stdout));
       }
     }
     if (!test.lastCommandOutput.stderr.isEmpty) {
       output.add('');
       output.add('stderr:');
-      for (var s in test.lastCommandOutput.stderr) {
-        output.add(s);
-      }
+      output.add(new String.fromCharCodes(test.lastCommandOutput.stderr));
     }
     for (Command c in test.commands) {
       output.add('');
       String message = (c == test.commands.last
           ? "Command line" : "Compilation command");
       output.add('$message: ${c.commandLine}');
     }
     return output;
   }
 
@@ skipping 271 matching lines @@
       print('');
       print('$config:');
       statuses.sort((a, b) => a.compareTo(b));
       for (String status in statuses) {
         print('  $status');
       }
     });
     _printStatus();
   }
 }