Add metadata annotations to library definitions.

pkg/kernel/lib/binary/ast_from_binary.dart

Index: pkg/kernel/lib/binary/ast_from_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_from_binary.dart b/pkg/kernel/lib/binary/ast_from_binary.dart
index ede560951607e8cd9311168d45637f46d98b2651..a86294d01f2fffedea04bcdd0753debe1494a31e 100644
--- a/pkg/kernel/lib/binary/ast_from_binary.dart
+++ b/pkg/kernel/lib/binary/ast_from_binary.dart
@@ -354,10 +354,10 @@ class BinaryBuilder {
       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);