Apply Siggi's comments (compile also for drt step).

tools/testing/dart/test_suite.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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 501 matching lines @@
       htmlTest.writeStringSync(GetHtmlContents(
           filename,
           '$filePrefix$dartDir/client/testing/unittest/test_controller.js',
           scriptType,
           filePrefix + scriptPath));
       htmlTest.closeSync();
 
       // Construct the command(s) that compile all the inputs needed by the
       // browser test. For running Dart in DRT, this will be noop commands.
       List<Command> commands = [];
-      if (compiler != 'none' && runtime != 'drt') {
+      if (compiler != 'none' ) {
         commands.add(_compileCommand(
             dartWrapperFilename, compiledDartWrapperFilename,
             compiler, tempDir.path, vmOptions));
 
         // some tests require compiling multiple input scripts.
         List<String> otherScripts = optionsFromFile['otherScripts'];
         for (String name in otherScripts) {
           int end = filename.lastIndexOf('/');
           if (end == -1) {
             print('Warning: error processing "OtherScripts" of $filename.');
@@ skipping 701 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
 """;
     print(report);
    }
 }