Sort navigation regions after gathering results from all of the contributors.

pkg/analysis_server/lib/src/domains/analysis/navigation.dart

Index: pkg/analysis_server/lib/src/domains/analysis/navigation.dart
diff --git a/pkg/analysis_server/lib/src/domains/analysis/navigation.dart b/pkg/analysis_server/lib/src/domains/analysis/navigation.dart
index 8cb08ae4e21b602108e25839c8cb0dd327497bc8..859cd7cf92d21a8fc614a81789d9a443ef1c60e2 100644
--- a/pkg/analysis_server/lib/src/domains/analysis/navigation.dart
+++ b/pkg/analysis_server/lib/src/domains/analysis/navigation.dart
@@ -32,6 +32,7 @@ NavigationHolderImpl computeNavigation(AnalysisServer server,
           new CaughtException(exception, stackTrace));
     }
   }
+  holder.sortRegions();
   return holder;
 }
 
@@ -66,6 +67,12 @@ class NavigationHolderImpl implements NavigationHolder {
     regions.add(region);
   }
 
+  void sortRegions() {
+    regions.sort((a, b) {
+      return a.offset - b.offset;
+    });
+  }
+
   int _addFile(String file) {
     int index = fileMap[file];
     if (index == null) {