Support forEachClassMember on closure classes

pkg/compiler/lib/src/universe/use.dart

Index: pkg/compiler/lib/src/universe/use.dart
diff --git a/pkg/compiler/lib/src/universe/use.dart b/pkg/compiler/lib/src/universe/use.dart
index 8c899c06cdd865c802df66c0fb05cc2ff046eb3b..124f1815194b36a462133e030d03a1267355952b 100644
--- a/pkg/compiler/lib/src/universe/use.dart
+++ b/pkg/compiler/lib/src/universe/use.dart
@@ -77,6 +77,7 @@ enum StaticUseKind {
   FIELD_GET,
   FIELD_SET,
   CLOSURE,
+  CALL_METHOD,
   CONSTRUCTOR_INVOKE,
   CONST_CONSTRUCTOR_INVOKE,
   REDIRECTION,
@@ -377,6 +378,11 @@ class StaticUse {
     return new StaticUse.internal(element, StaticUseKind.CLOSURE);
   }
 
+  /// Read of a call [method] on a closureClass.
+  factory StaticUse.callMethod(FunctionEntity method) {
+    return new StaticUse.internal(method, StaticUseKind.CALL_METHOD);
+  }
+
   /// Use of [element] through reflection.
   factory StaticUse.mirrorUse(MemberEntity element) {
     return new StaticUse.internal(element, StaticUseKind.GENERAL);