Fix evaluate with context debug protocol

src/debug-debugger.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1840 matching lines @@
   }
 
   // Check for legal arguments.
   if (!IS_UNDEFINED(frame) && global) {
     return response.failed('Arguments "frame" and "global" are exclusive');
   }
   
   var additional_context_object;
   if (additional_context) {
     additional_context_object = {};
-    for (var key in additional_context) {
-      var context_value_handle = additional_context[key];
-      var context_value_mirror = LookupMirror(context_value_handle);
+    for (var i = 0; i < additional_context.length; i++) {
+      var mapping = additional_context[i];
+      if (!IS_STRING(mapping.name) || !IS_NUMBER(mapping.handle)) {
+        return response.failed("Context element #" + i + 
+            " must contain name:string and handle:number");
+      } 
+      var context_value_mirror = LookupMirror(mapping.handle);
       if (!context_value_mirror) {
-        return response.failed(
-            "Context object '" + key + "' #" + context_value_handle +
-                "# not found");
+        return response.failed("Context object '" + mapping.name +
+            "' #" + mapping.handle + "# not found");
       }
-      additional_context_object[key] = context_value_mirror.value(); 
+      additional_context_object[mapping.name] = context_value_mirror.value(); 
     }
   }
 
   // Global evaluate.
   if (global) {
     // Evaluate in the global context.
     response.body = this.exec_state_.evaluateGlobal(
         expression, Boolean(disable_break), additional_context_object);
     return;
   }
@@ skipping 409 matching lines @@
     case 'string':
     case 'number':
       json = value;
       break
 
     default:
       json = null;
   }
   return json;
 }