Serialize and resynthesize labels.

pkg/analyzer/lib/src/summary/summarize_elements.dart

Index: pkg/analyzer/lib/src/summary/summarize_elements.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_elements.dart b/pkg/analyzer/lib/src/summary/summarize_elements.dart
index 3f39a38528451162b3ff90d9392c92cb83f94799..7fdc0dadd3e55280743f2ba24ec05b42b8db0215 100644
--- a/pkg/analyzer/lib/src/summary/summarize_elements.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_elements.dart
@@ -604,6 +604,7 @@ class _CompilationUnitSerializer {
     }
     b.localFunctions =
         executableElement.functions.map(serializeExecutable).toList();
+    b.localLabels = executableElement.labels.map(serializeLabel).toList();
     b.localVariables =
         executableElement.localVariables.map(serializeVariable).toList();
     return b;
@@ -658,6 +659,18 @@ class _CompilationUnitSerializer {
   }
 
   /**
+   * Serialize the given [label], creating an [UnlinkedLabelBuilder].
+   */
+  UnlinkedLabelBuilder serializeLabel(LabelElementImpl label) {
+    UnlinkedLabelBuilder b = new UnlinkedLabelBuilder();
+    b.name = label.name;
+    b.nameOffset = label.nameOffset;
+    b.isOnSwitchMember = label.isOnSwitchMember;
+    b.isOnSwitchStatement = label.isOnSwitchStatement;
+    return b;
+  }
+
+  /**
    * Serialize the given [parameter] into an [UnlinkedParam].
    */
   UnlinkedParamBuilder serializeParam(ParameterElement parameter,