Add metadata annotations to library definitions.

pkg/kernel/lib/binary/ast_to_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_to_binary;
 
 import '../ast.dart';
 import '../import_table.dart';
 import 'tag.dart';
 import 'dart:convert';
 import 'dart:typed_data';
@@ skipping 237 matching lines @@
 
   bool insideExternalLibrary = false;
 
   visitLibrary(Library node) {
     insideExternalLibrary = node.isExternal;
     writeByte(insideExternalLibrary ? 1 : 0);
     writeCanonicalNameReference(getCanonicalNameOfLibrary(node));
     writeStringReference(node.name ?? '');
     // TODO(jensj): We save (almost) the same URI twice.
     writeUriReference(node.fileUri ?? '');
+    writeAnnotationList(node.annotations);
     writeLibraryDependencies(node);
     writeNodeList(node.typedefs);
     writeNodeList(node.classes);
     writeNodeList(node.fields);
     writeNodeList(node.procedures);
   }
 
   void writeLibraryDependencies(Library library) {
     _libraryDependencyIndex = library.dependencies.isEmpty
         ? const <LibraryDependency, int>{}
@@ skipping 1136 matching lines @@
     _sink.add(_buffer.sublist(0, length));
     _buffer = new Uint8List(SIZE);
     flushedLength += length;
     length = 0;
   }
 
   void flushAndDestroy() {
     _sink.add(_buffer.sublist(0, length));
   }
 }