Add ClosureInfo for closures.

bin/debug_info.dart

 // Copyright (c) 2015, 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.
 
 /// Tool used mainly by dart2js developers to debug the generated info and check
 /// that it is consistent and that it covers all the data we expect it to cover.
 library dart2js_info.bin.debug_info;
 
 import 'dart:io';
 
@@ skipping 49 matching lines @@
   int totalLib = info.libraries.fold(0, (n, lib) => n + lib.size);
   int constantsSize = info.constants.fold(0, (n, c) => n + c.size);
   int accounted = totalLib + constantsSize;
 
   if (accounted != realTotal) {
     var percent =
         ((realTotal - accounted) * 100 / realTotal).toStringAsFixed(2);
     _fail('$percent% size missing: $accounted (all libs + consts) '
         '< $realTotal (total)');
   }
-  var missingTotal = tracker.missing.values.fold(0, (a, b) => a + b);
+  int missingTotal = tracker.missing.values.fold(0, (a, b) => a + b);
   if (missingTotal > 0) {
     var percent = (missingTotal * 100 / realTotal).toStringAsFixed(2);
     _fail('$percent% size missing in libraries (sum of elements > lib.size)');
   }
 }
 
 class _SizeTracker extends RecursiveInfoVisitor {
   /// A library name for which to print debugging information (if not null).
   final String _debugLibName;
 
@@ skipping 193 matching lines @@
   if (unreachables.isNotEmpty) {
     _fail('${unreachables.length} elements are unreachable from the '
         'entrypoint');
   } else {
     _pass('all elements are reachable from the entrypoint');
   }
 }
 
 _pass(String msg) => print('\x1b[32mPASS\x1b[0m: $msg');
 _fail(String msg) => print('\x1b[31mFAIL\x1b[0m: $msg');