Make server use the common protocol classes

pkg/analysis_server/tool/spec/api.dart

Index: pkg/analysis_server/tool/spec/api.dart
diff --git a/pkg/analysis_server/tool/spec/api.dart b/pkg/analysis_server/tool/spec/api.dart
index 746621f2616561ecd1a0155059fc1ebfda5af78d..1fd0c67e649739260463a24219da958e29e0d964 100644
--- a/pkg/analysis_server/tool/spec/api.dart
+++ b/pkg/analysis_server/tool/spec/api.dart
@@ -358,6 +358,8 @@ class TypeDefinition extends ApiNode {
   final String name;
   final TypeDecl type;
 
+  bool isExternal = false;
+
   TypeDefinition(this.name, this.type, dom.Element html,
       {bool experimental, bool deprecated})
       : super(html, experimental, deprecated);
@@ -492,6 +494,8 @@ class TypeReference extends TypeDecl {
 class Types extends ApiNode with IterableMixin<TypeDefinition> {
   final Map<String, TypeDefinition> types;
 
+  List<String> importUris = <String>[];
+
   Types(this.types, dom.Element html, {bool experimental})
       : super(html, experimental, false);