Forward Kythe requests to plugins and merge in the results

pkg/analysis_server/lib/src/plugin/result_merger.dart

Index: pkg/analysis_server/lib/src/plugin/result_merger.dart
diff --git a/pkg/analysis_server/lib/src/plugin/result_merger.dart b/pkg/analysis_server/lib/src/plugin/result_merger.dart
index 5b262c1eb59003d6136602c683afd2a93191e8f4..06f08405ee237a386a9079bd89e96b921d173e4b 100644
--- a/pkg/analysis_server/lib/src/plugin/result_merger.dart
+++ b/pkg/analysis_server/lib/src/plugin/result_merger.dart
@@ -202,6 +202,25 @@ class ResultMerger {
   }
 
   /**
+   * Return kythe entry result parameters composed by merging the parameters in
+   * the [partialResultList].
+   *
+   * The resulting list will contain all of the kythe entries from all of the
+   * plugins. If a plugin contributes a kythe entry that is the same as the
+   * entry from a different plugin, the entry will appear twice in the list.
+   */
+  KytheGetKytheEntriesResult mergeKytheEntries(
+      List<KytheGetKytheEntriesResult> partialResultList) {
+    List<KytheEntry> mergedEntries = <KytheEntry>[];
+    Set<String> mergedFiles = new Set<String>();
+    for (KytheGetKytheEntriesResult partialResult in partialResultList) {
+      mergedEntries.addAll(partialResult.entries);
+      mergedFiles.addAll(partialResult.files);
+    }
+    return new KytheGetKytheEntriesResult(mergedEntries, mergedFiles.toList());
+  }
+
+  /**
    * Return navigation notification parameters composed by merging the
    * parameters in the [partialResultList].
    *