Add SourceRange support to navigation collector

pkg/analyzer_plugin/lib/src/utilities/navigation/navigation.dart

Index: pkg/analyzer_plugin/lib/src/utilities/navigation/navigation.dart
diff --git a/pkg/analyzer_plugin/lib/src/utilities/navigation/navigation.dart b/pkg/analyzer_plugin/lib/src/utilities/navigation/navigation.dart
index e513c86670a689b8a61d7850a0926f6921dcc9af..1062970658771d723440c02a518b667314184c12 100644
--- a/pkg/analyzer_plugin/lib/src/utilities/navigation/navigation.dart
+++ b/pkg/analyzer_plugin/lib/src/utilities/navigation/navigation.dart
@@ -59,6 +59,12 @@ class NavigationCollectorImpl implements NavigationCollector {
   final Map<String, int> fileMap = <String, int>{};
 
   @override
+  void addRange(
+      SourceRange range, ElementKind targetKind, Location targetLocation) {
+    addRegion(range.offset, range.length, targetKind, targetLocation);
+  }
+
+  @override
   void addRegion(
       int offset, int length, ElementKind targetKind, Location targetLocation) {
     SourceRange range = new SourceRange(offset, length);