Add ClosureClassMaps super interface for ClosureTask

pkg/compiler/lib/src/kernel/element_map_impl.dart

Index: pkg/compiler/lib/src/kernel/element_map_impl.dart
diff --git a/pkg/compiler/lib/src/kernel/element_map_impl.dart b/pkg/compiler/lib/src/kernel/element_map_impl.dart
index 1bf6220f785493cdb51032da9628b41826cf7e98..e06221d78ed91e3101dd72da5afdeb50b79c38e4 100644
--- a/pkg/compiler/lib/src/kernel/element_map_impl.dart
+++ b/pkg/compiler/lib/src/kernel/element_map_impl.dart
@@ -685,6 +685,10 @@ class KernelToElementMapImpl extends KernelToElementMapMixin {
   Spannable getSpannable(MemberEntity member, ir.Node node) {
     return member;
   }
+
+  ir.Member getMemberRoot(KMember member) {

[Siggi Cherem (dart-lang), 2017/05/24 17:26:25]

what is a member root?

[Emily Fortuna, 2017/05/24 17:48:08]

+1

[Johnni Winther, 2017/05/29 08:17:40]

Renamed to [getMemberNode] and added docs.

+    return _memberList[member.memberIndex].node;
+  }
 }
 
 /// Environment for fast lookup of program libraries.