Merge kernel closure conversion into the Dart SDK

pkg/kernel/lib/kernel.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 file.
 
 /// Conventions for paths:
 ///
 /// - Use the [Uri] class for paths that may have the `file`, `dart` or
 ///   `package` scheme.  Never use [Uri] for relative paths.
 /// - Use [String]s for all filenames and paths that have no scheme prefix.
 /// - Never translate a `dart:` or `package:` URI into a `file:` URI, instead
@@ skipping 32 matching lines @@
 void writeLibraryToText(Library library, {String path}) {
   StringBuffer buffer = new StringBuffer();
   new Printer(buffer).writeLibraryFile(library);
   if (path == null) {
     print(buffer);
   } else {
     new File(path).writeAsStringSync('$buffer');
   }
 }
 
-void writeProgramToText(Program program, {String path, bool showExternal: false}) {
+void writeProgramToText(Program program,
+    {String path, bool showExternal: false}) {
   StringBuffer buffer = new StringBuffer();
   new Printer(buffer, showExternal: showExternal).writeProgramFile(program);
   if (path == null) {
     print(buffer);
   } else {
     new File(path).writeAsStringSync('$buffer');
   }
 }