Merge the work on Generic Types Reification from 'dart-lang/reify' repo

pkg/kernel/test/closures/suite.dart

 // Copyright (c) 2016, 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.md file.
 
 library test.kernel.closures.suite;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show Directory, File, Platform;
 
@@ skipping 108 matching lines @@
   if (await fileExists(sdkUri, asyncSources)) {
     throw "Found '$asyncSources' in '$sdk', so it isn't a patched SDK. "
         "$suggestion";
   }
 
   // TODO(karlklose): select the VM based on the mode.
   Uri vm = Uri.base.resolve("out/ReleaseX64/dart");
 
   Uri packages = Uri.base.resolve(".packages");
   bool strongMode = false;
-  bool updateExpectations = environment["updateExpectations"] != "false";
+  bool updateExpectations = environment["updateExpectations"] == "true";
   return new TestContext(sdk, vm, packages, strongMode,
       createDartSdk(sdk, strongMode: strongMode), updateExpectations);
 }
 
 class Kernel extends Step<TestDescription, Program, TestContext> {
   const Kernel();
 
   String get name => "kernel";
 
   Future<Result<Program>> run(
@@ skipping 46 matching lines @@
           .run(context.vm.toFilePath(), [generated.path, "Hello, World!"]);
       print(process.output);
     } finally {
       generated.parent.delete(recursive: true);
     }
     return process.toResult();
   }
 }
 
 main(List<String> arguments) => runMe(arguments, createContext, "testing.json");