1 files changed, 10 insertions, 0 deletions
diff --git a/deps/v8/src/zone.h b/deps/v8/src/zone.h
index 3397356223..dde722f675 100644
--- a/deps/v8/src/zone.h
+++ b/deps/v8/src/zone.h
@@ -169,9 +169,19 @@ class ZoneList: public List<T, ZoneListAllocationPolicy> {
   // always zero. The capacity must be non-negative.
   explicit ZoneList(int capacity)
       : List<T, ZoneListAllocationPolicy>(capacity) { }
+
+  // Construct a new ZoneList by copying the elements of the given ZoneList.
+  explicit ZoneList(const ZoneList<T>& other)
+      : List<T, ZoneListAllocationPolicy>(other.length()) {
+    AddAll(other);
+  }
 };
 
 
+// Introduce a convenience type for zone lists of map handles.
+typedef ZoneList<Handle<Map> > ZoneMapList;
+
+
 // ZoneScopes keep track of the current parsing and compilation
 // nesting and cleans up generated ASTs in the Zone when exiting the
 // outer-most scope.