Add SourceFileEdit.time field.

pkg/analysis_server/tool/spec/codegen_dart_protocol.dart

Index: pkg/analysis_server/tool/spec/codegen_dart_protocol.dart
diff --git a/pkg/analysis_server/tool/spec/codegen_dart_protocol.dart b/pkg/analysis_server/tool/spec/codegen_dart_protocol.dart
index 43fc138473a4f629891144af34f466a087381cc7..57e066d3006dcc49151f8d4c00b79ac4ab25934c 100644
--- a/pkg/analysis_server/tool/spec/codegen_dart_protocol.dart
+++ b/pkg/analysis_server/tool/spec/codegen_dart_protocol.dart
@@ -201,7 +201,7 @@ class CodegenProtocolVisitor extends HierarchicalApiVisitor with CodeGenerator {
   static const Map<String, List<String>> _optionalConstructorArguments = const {
     'AnalysisErrorFixes': const ['fixes'],
     'SourceChange': const ['edits', 'linkedEditGroups'],
-    'SourceFileEdit': const ['edits'],
+    'SourceFileEdit': const ['time', 'edits'],
     'TypeHierarchyItem': const ['interfaces', 'mixins', 'subclasses'],
   };
 
@@ -623,6 +623,15 @@ class CodegenProtocolVisitor extends HierarchicalApiVisitor with CodeGenerator {
             writeln('}');
           });
         }
+        if (className == 'SourceFileEdit' && field.name == 'time') {
+          extraInitCode.add(() {
+            writeln('if (${field.name} == null) {');
+            indent(() {
+              writeln('${field.name} = new DateTime.now().millisecondsSinceEpoch;');
+            });
+            writeln('}');
+          });
+        }
       } else {
         args.add(arg);
       }