Completion boilerplate for Flutter cons children (flutter-intellij#463)

pkg/analysis_server/lib/src/provisional/completion/completion_core.dart

Index: pkg/analysis_server/lib/src/provisional/completion/completion_core.dart
diff --git a/pkg/analysis_server/lib/src/provisional/completion/completion_core.dart b/pkg/analysis_server/lib/src/provisional/completion/completion_core.dart
index b3582c90c7804ff50e763d1b416369b75be4ae3a..28bd4abf3e23a368728d83bf5c93e35f5dce61d3 100644
--- a/pkg/analysis_server/lib/src/provisional/completion/completion_core.dart
+++ b/pkg/analysis_server/lib/src/provisional/completion/completion_core.dart
@@ -7,6 +7,7 @@ library analysis_server.src.provisional.completion.completion_core;
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
+import 'package:analysis_server/src/ide_options.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
@@ -61,6 +62,11 @@ abstract class CompletionRequest {
   AnalysisContext get context;
 
   /**
+   * IDE options for this server instance.
+   */
+  IdeOptions get ideOptions;
+
+  /**
    * Return the offset within the source at which the completion is being
    * requested.
    */