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

tools/testing/dart/test_runner.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 executing tests.
  *
  * This module includes:
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
@@ skipping 1183 matching lines @@
          while (stream.readLine() != null) {
           // Do nothing.
         }
         return;
       }
       // Otherwise, process output and call _reportResult() when done.
       var line = stream.readLine();
       while (line != null) {
         if (line.startsWith('>>> TEST')) {
           _status = line;
-        } else if (line.startsWith('>>> BATCH START')) {
+        } else if (line.startsWith('>>> BATCH')) {
           // ignore
         } else if (line.startsWith('>>> ')) {
           throw new Exception('Unexpected command from dartc batch runner.');
         } else {
           buffer.addAll(encodeUtf8(line));
           buffer.addAll("\n".charCodes);
         }
         line = stream.readLine();
       }
       if (_status != null) {
@@ skipping 531 matching lines @@
           completer.complete(testCase);
         }
       });
     }
     runCommand();
 
     return completer.future;
   }
 }