[V8] Add name of function for function's closure scope

src/debug/mirrors.js

Index: src/debug/mirrors.js
diff --git a/src/debug/mirrors.js b/src/debug/mirrors.js
index 11f9e485c13be252986a228826de69c9ea83bf5c..7b27f5e270fbd1df6f03b53dd7d6d747a7d88ccf 100644
--- a/src/debug/mirrors.js
+++ b/src/debug/mirrors.js
@@ -2233,8 +2233,10 @@ FrameMirror.prototype.toText = function(opt_locals) {
 };
 
 
+// This indexes correspond definitions in debug-scopes.h.
 var kScopeDetailsTypeIndex = 0;
 var kScopeDetailsObjectIndex = 1;
+var kScopeDetailsNameIndex = 2;
 
 function ScopeDetails(frame, fun, index, opt_details) {
   if (frame) {
@@ -2271,6 +2273,14 @@ ScopeDetails.prototype.object = function() {
 };
 
 
+ScopeDetails.prototype.name = function() {
+  if (!IS_UNDEFINED(this.break_id_)) {
+    %CheckExecutionState(this.break_id_);
+  }
+  return this.details_[kScopeDetailsNameIndex];
+};
+
+
 ScopeDetails.prototype.setVariableValueImpl = function(name, new_value) {
   var raw_res;
   if (!IS_UNDEFINED(this.break_id_)) {