Add logging system to pub and sprinkle some logging in.

utils/tests/pub/test_pub.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.
 
 /**
  * Test infrastructure for testing pub. Unlike typical unit tests, most pub
  * tests are integration tests that stage some stuff on the file system, run
  * pub, and then validate the results. This library provides an API to build
  * tests like that.
  */
@@ skipping 620 matching lines @@
 
     // If the executable looks like a path, get its full path. That way we
     // can still find it when we spawn it with a different working directory.
     if (dartBin.contains(Platform.pathSeparator)) {
       dartBin = new File(dartBin).fullPathSync();
     }
 
     // Find the main pub entrypoint.
     var pubPath = fs.joinPaths(testDirectory, '../../pub/pub.dart');
 
-    var dartArgs =
-        ['--enable-type-checks', '--enable-asserts', pubPath, '--trace'];
+    var dartArgs = ['--checked', pubPath, '--trace'];
     dartArgs.addAll(args);
 
     var environment = {
       'PUB_CACHE': pathInSandbox(cachePath),
       'DART_SDK': pathInSandbox(sdkPath)
     };
+
     if (tokenEndpoint != null) {
       environment['_PUB_TEST_TOKEN_ENDPOINT'] = tokenEndpoint.toString();
     }
 
     return fn(dartBin, dartArgs, workingDir: pathInSandbox(appPath),
         environment: environment);
   });
 }
 
 /**
@@ skipping 971 matching lines @@
 /// calling [completion] is unnecessary.
 void expectLater(Future actual, matcher, {String reason,
     FailureHandler failureHandler, bool verbose: false}) {
   _schedule((_) {
     return actual.transform((value) {
       expect(value, matcher, reason: reason, failureHandler: failureHandler,
           verbose: false);
     });
   });
 }