Include default parameter values into summary.

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

Index: pkg/analyzer/lib/src/summary/summarize_ast.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_ast.dart b/pkg/analyzer/lib/src/summary/summarize_ast.dart
index e956a52e2aeacb18ac47e6bb5ecb5434c95ec7fc..fbe285782b2ba9e263fefd2d5cacf9f2f87a1a41 100644
--- a/pkg/analyzer/lib/src/summary/summarize_ast.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_ast.dart
@@ -62,9 +62,8 @@ class _ConstExprSerializer extends AbstractConstExprSerializer {
     Expression target = access.target;
     if (target is Identifier) {
       EntityRefBuilder targetRef = serializeIdentifier(target);
-      return new EntityRefBuilder(
-          reference: visitor.serializeReference(
-              targetRef.reference, access.propertyName.name));
+      return new EntityRefBuilder(reference: visitor.serializeReference(
+          targetRef.reference, access.propertyName.name));
     } else {
       // TODO(scheglov) should we handle other targets in malformed constants?
       throw new StateError('Unexpected target type: ${target.runtimeType}');
@@ -696,7 +695,11 @@ class _SummarizeAstVisitor extends SimpleAstVisitor {
   @override
   UnlinkedParamBuilder visitDefaultFormalParameter(
       DefaultFormalParameter node) {
-    return node.parameter.accept(this);
+    UnlinkedParamBuilder b = node.parameter.accept(this);
+    if (node.defaultValue != null) {
+      b.defaultValue = serializeConstExpr(node.defaultValue);
+    }
+    return b;
   }
 
   @override