Add metadata annotations to library definitions.

pkg/kernel/lib/text/ast_to_text.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_text;
 
 import '../ast.dart';
 import '../import_table.dart';
 
 class Namer<T> {
   int index = 0;
@@ skipping 247 matching lines @@
       return '$member::$name';
     } else if (node.parent is Class) {
       String className = getClassReference(node.parent);
       return '$className::$name';
     } else {
       return name; // Bound inside a function type.
     }
   }
 
   void writeLibraryFile(Library library) {
+    writeAnnotationList(library.annotations);
     writeWord('library');
     if (library.name != null) {
       writeWord(library.name);
     }
     endLine(';');
     var imports = new LibraryImportTable(library);
     for (var library in imports.importedLibraries) {
       var importPath = imports.getImportPath(library);
       if (importPath == "") {
         var prefix =
@@ skipping 23 matching lines @@
     writeSpaced('=');
     inner.writeMemberReference(program.mainMethod);
     endLine(';');
     for (var library in program.libraries) {
       if (library.isExternal) {
         if (!showExternal) {
           continue;
         }
         writeWord('external');
       }
+      writeAnnotationList(library.annotations);
       writeWord('library');
       if (library.name != null) {
         writeWord(library.name);
       }
       if (library.importUri != null) {
         writeSpaced('from');
         writeWord('"${library.importUri}"');
       }
       var prefix = syntheticNames.nameLibraryPrefix(library);
       writeSpaced('as');
@@ skipping 1332 matching lines @@
   }
   throw 'illegal ProcedureKind: $kind';
 }
 
 class ExpressionPrinter {
   final Printer writeer;
   final int minimumPrecedence;
 
   ExpressionPrinter(this.writeer, this.minimumPrecedence);
 }