Add more tested features to closure_test

pkg/compiler/lib/src/closure.dart

Index: pkg/compiler/lib/src/closure.dart
diff --git a/pkg/compiler/lib/src/closure.dart b/pkg/compiler/lib/src/closure.dart
index 5b43c620643ced8991ec76a4be9b896183b556e6..4b114d38a174976f0ed95ee0ae6460cedba1eca7 100644
--- a/pkg/compiler/lib/src/closure.dart
+++ b/pkg/compiler/lib/src/closure.dart
@@ -51,6 +51,9 @@ abstract class ClosureDataLookup<T> {
   ClosureRepresentationInfo getClosureRepresentationInfo(
       covariant Entity member);
 
+  ClosureRepresentationInfo getClosureRepresentationInfoForTesting(
+      covariant Entity member);
+
   /// Look up information about a loop, in case any variables it declares need
   /// to be boxed/snapshotted.
   CapturedLoopScope getCapturedLoopScope(T loopNode);
@@ -289,6 +292,11 @@ class ClosureTask extends ClosureConversionTask<Node> {
     return getClosureToClassMapping(member);
   }
 
+  ClosureRepresentationInfo getClosureRepresentationInfoForTesting(
+      Element member) {
+    return getClosureRepresentationInfo(member);
+  }
+
   CapturedLoopScope getCapturedLoopScope(Node loopNode) {
     var value = _closureInfoMap[loopNode];
     return value == null ? const CapturedLoopScope() : value;