Introduce code to generate summaries from an element model.

pkg/analyzer/lib/src/summary/format.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.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script "pkg/analyzer/tool/generate_files".
 
 library analyzer.src.summary.format;
 
+import 'dart:convert';
 import 'builder.dart' as builder;
 
 enum PrelinkedReferenceKind {
   classOrEnum,
   typedef,
   other,
   unresolved,
 }
 
 enum UnlinkedExecutableKind {
@@ skipping 44 matching lines @@
   List<PrelinkedDependency> _dependencies;
   List<int> _importDependencies;
   List<PrelinkedReference> _references;
 
   PrelinkedLibrary.fromJson(Map json)
     : _unlinked = json["unlinked"] == null ? null : new UnlinkedLibrary.fromJson(json["unlinked"]),
       _dependencies = json["dependencies"]?.map((x) => new PrelinkedDependency.fromJson(x))?.toList(),
       _importDependencies = json["importDependencies"],
       _references = json["references"]?.map((x) => new PrelinkedReference.fromJson(x))?.toList();
 
+  PrelinkedLibrary.fromBuffer(List<int> buffer) : this.fromJson(JSON.decode(UTF8.decode(buffer)));
+
   UnlinkedLibrary get unlinked => _unlinked;
   List<PrelinkedDependency> get dependencies => _dependencies ?? const <PrelinkedDependency>[];
   List<int> get importDependencies => _importDependencies ?? const <int>[];
   List<PrelinkedReference> get references => _references ?? const <PrelinkedReference>[];
 }
 
 class PrelinkedLibraryBuilder {
   final Map _json = {};
 
   PrelinkedLibraryBuilder(builder.BuilderContext context);
@@ skipping 1187 matching lines @@
   UnlinkedVariableBuilder builder = new UnlinkedVariableBuilder(builderContext);
   builder.name = name;
   builder.unit = unit;
   builder.type = type;
   builder.isStatic = isStatic;
   builder.isFinal = isFinal;
   builder.isConst = isConst;
   return builder.finish();
 }