Add metadata annotations to library definitions.

pkg/kernel/lib/binary/ast_from_binary.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.
 library kernel.ast_from_binary;
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import '../ast.dart';
 import '../transformations/flags.dart';
@@ skipping 336 matching lines @@
     String name = readStringOrNullIfEmpty();
     // TODO(jensj): We currently save (almost the same) uri twice.
     String fileUri = readUriReference();
 
     if (shouldWriteData) {
       library.isExternal = isExternal;
       library.name = name;
       library.fileUri = fileUri;
     }
 
-    _readLibraryDependencies(library);
-
     debugPath.add(library.name ?? library.importUri?.toString() ?? 'library');
 
+    _fillTreeNodeList(library.annotations, readExpression, library);
+    _readLibraryDependencies(library);
     _mergeNamedNodeList(library.typedefs, readTypedef, library);
     _mergeNamedNodeList(library.classes, readClass, library);
     _mergeNamedNodeList(library.fields, readField, library);
     _mergeNamedNodeList(library.procedures, readProcedure, library);
 
     debugPath.removeLast();
     _currentLibrary = null;
     return library;
   }
 
@@ skipping 820 matching lines @@
       ..fileOffset = offset
       ..fileEqualsOffset = fileEqualsOffset;
   }
 
   int readOffset() {
     // Offset is saved as unsigned,
     // but actually ranges from -1 and up (thus the -1)
     return readUInt() - 1;
   }
 }