Add dart analyzer test suite 'analyze_library' that fails if we

samples/tests/dartc/test_config.dart

 // Copyright (c) 2011, 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 client_dartc_test_config;
 
 import 'dart:io';
 import '../../../tools/testing/dart/test_suite.dart';
 
 class SamplesDartcTestSuite extends DartcCompilationTestSuite {
@@ skipping 20 matching lines @@
                 'sunflower',
                 'swarm',
                 'tests',
                 'third_party',
                 'time',
                 'ui_lib',
               ],
               ['samples/tests/dartc/dartc.status']);
 
   bool isTestFile(String filename) {
-    if (!filename.endsWith(".dart")) return false;
-    // Using readOptionsFromFile here causes the file to be read twice,
-    // because readOptionsFromFile is called again in the superclass.
-    // Avoid this in new code.
-    return StandardTestSuite.readOptionsFromFile(new Path(filename))
-        ["containsLeadingHash"];
+    return filename.endsWith(".dart");
   }
 
   bool get listRecursively => true;
 }