Add an optional 'typeParameters' to Element.

pkg/analysis_server/test/integration/protocol_matchers.dart

Index: pkg/analysis_server/test/integration/protocol_matchers.dart
diff --git a/pkg/analysis_server/test/integration/protocol_matchers.dart b/pkg/analysis_server/test/integration/protocol_matchers.dart
index 633c3803e884a1b9abe206b3b8cfe00eb1d7bedf..ad98577247f1e0aa5f863e0872affdc57cf618cc 100644
--- a/pkg/analysis_server/test/integration/protocol_matchers.dart
+++ b/pkg/analysis_server/test/integration/protocol_matchers.dart
@@ -1178,6 +1178,7 @@ final Matcher isCompletionSuggestionKind = new MatchesEnum("CompletionSuggestion
  *   "flags": int
  *   "parameters": optional String
  *   "returnType": optional String
+ *   "typeParameters": optional String
  * }
  */
 final Matcher isElement = new LazyMatcher(() => new MatchesJsonObject(
@@ -1188,7 +1189,8 @@ final Matcher isElement = new LazyMatcher(() => new MatchesJsonObject(
   }, optionalFields: {
     "location": isLocation,
     "parameters": isString,
-    "returnType": isString
+    "returnType": isString,
+    "typeParameters": isString
   }));
 
 /**