Reapply "Add "load from .dill" file capability and run a white-box test.""

pkg/compiler/lib/src/dump_info.dart

 // Copyright (c) 2013, 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.
 
 library dump_info;
 
 import 'dart:convert'
     show ChunkedConversionSink, JsonEncoder, StringConversionSink;
 
 import 'package:dart2js_info/info.dart';
@@ skipping 30 matching lines @@
   void run() {
     compiler.dumpInfoTask._constantToNode.forEach((constant, node) {
       // TODO(sigmund): add dependencies on other constants
       var size = compiler.dumpInfoTask._nodeToSize[node];
       var code = jsAst.prettyPrint(node, compiler);
       var info = new ConstantInfo(
           size: size, code: code, outputUnit: _unitInfoForConstant(constant));
       _constantToInfo[constant] = info;
       result.constants.add(info);
     });
-    compiler.libraryLoader.libraries.forEach(visit);
+    (compiler.libraryLoader.libraries as Iterable<LibraryElement>)
+        .forEach(visit);
   }
 
   Info visit(Element e, [_]) => e.accept(this, null);
 
   /// Whether to emit information about [element].
   ///
   /// By default we emit information for any element that contributes to the
   /// output size. Either because the it is a function being emitted or inlined,
   /// or because it is an element that holds dependencies to other elements.
   bool shouldKeep(Element element) {
@@ skipping 554 matching lines @@
 
     ChunkedConversionSink<Object> sink = encoder.startChunkedConversion(
         new StringConversionSink.fromStringSink(buffer));
     sink.add(new AllInfoJsonCodec().encode(result));
     compiler.reporter.reportInfo(NO_LOCATION_SPANNABLE, MessageKind.GENERIC, {
       'text': "View the dumped .info.json file at "
           "https://dart-lang.github.io/dump-info-visualizer"
     });
   }
 }