Add option to run ScopeIterator faster giving up nested scope chain.

src/mirror-debugger.js

Index: src/mirror-debugger.js
diff --git a/src/mirror-debugger.js b/src/mirror-debugger.js
index f288123bcafad8ea3ea01b9f626ebe8a7c612d32..b07d1fef7a369e92b149f5ff7c72e2ab3c47ee71 100644
--- a/src/mirror-debugger.js
+++ b/src/mirror-debugger.js
@@ -1692,10 +1692,11 @@ FrameMirror.prototype.scope = function(index) {
 };
 
 
-FrameMirror.prototype.allScopes = function() {
+FrameMirror.prototype.allScopes = function(opt_ignore_nested_scopes) {
   var scopeDetails = %GetAllScopesDetails(this.break_id_,
                                           this.details_.frameId(),
-                                          this.details_.inlinedFrameIndex());
+                                          this.details_.inlinedFrameIndex(),
+                                          !!opt_ignore_nested_scopes);
   var result = [];
   for (var i = 0; i < scopeDetails.length; ++i) {
     result.push(new ScopeMirror(this, UNDEFINED, i, scopeDetails[i]));