Fixes to get Swarm demo working again.

frog/member.dart

Index: frog/member.dart
diff --git a/frog/member.dart b/frog/member.dart
index e9fd27d5910d63a51c45ee14f12cb0c236928bc8..04ecd2fab28cb6fe268212ccb0054b118a75214b 100644
--- a/frog/member.dart
+++ b/frog/member.dart
@@ -115,6 +115,8 @@ class Member implements Named {
   bool get isProperty() => false;
   bool get isAbstract() => false;
 
+  bool get isFinal() => false;
+
   // TODO(jmesserly): these only makes sense on methods, but because of
   // ConcreteMember we need to support them on Member.
   bool get isConst() => false;
@@ -142,6 +144,10 @@ class Member implements Named {
     world.internalError('cannot have initializers', span);
   }
 
+  Value computeValue() {
+    world.internalError('cannot have value', span);
+  }
+
   /**
    * The inferred returnType. Right now this is just used to track
    * non-nullable bools.
@@ -556,6 +562,7 @@ class ConcreteMember extends Member {
   bool get isAbstract() => baseMember.isAbstract;
   bool get isConst() => baseMember.isConst;
   bool get isFactory() => baseMember.isFactory;
+  bool get isFinal() => baseMember.isFinal;
 
   String get jsname() => baseMember.jsname;
   set jsname(String name) =>
@@ -592,6 +599,8 @@ class ConcreteMember extends Member {
     return type.resolveTypeParams(declaringType);
   }
 
+  Value computeValue() => baseMember.computeValue();
+
   // TODO(jimhug): Add support for type params.
   bool override(Member other) => baseMember.override(other);