Expose a lower bound of malloc'd memory via heap statistics

src/debug/debug-scopes.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/debug/debug-scopes.h"
 
 #include "src/ast/scopes.h"
 #include "src/debug/debug.h"
 #include "src/frames-inl.h"
 #include "src/globals.h"
@@ skipping 64 matching lines @@
       nested_scope_chain_.Add(ExtendedScopeInfo(scope_info,
                                                 shared_info->start_position(),
                                                 shared_info->end_position()));
     }
     if (!collect_non_locals) return;
   }
 
   // Reparse the code and analyze the scopes.
   Scope* scope = NULL;
   // Check whether we are in global, eval or function code.
-  Zone zone;
+  Zone zone(isolate->allocator());
   if (scope_info->scope_type() != FUNCTION_SCOPE) {
     // Global or eval code.
     Handle<Script> script(Script::cast(shared_info->script()));
     ParseInfo info(&zone, script);
     if (scope_info->scope_type() == SCRIPT_SCOPE) {
       info.set_global();
     } else {
       DCHECK(scope_info->scope_type() == EVAL_SCOPE);
       info.set_eval();
       info.set_context(Handle<Context>(function->context()));
@@ skipping 735 matching lines @@
     DCHECK(beg_pos >= 0 && end_pos >= 0);
     if (beg_pos <= position && position < end_pos) {
       GetNestedScopeChain(isolate, inner_scope, position);
       return;
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8