Experimental bots layout tests fix: handle access to the frame 0 in case ther...

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 760 matching lines @@
   return %GetFrameCount(this.break_id);
 };
 
 ExecutionState.prototype.threadCount = function() {
   return %GetThreadCount(this.break_id);
 };
 
 ExecutionState.prototype.frame = function(opt_index) {
   // If no index supplied return the selected frame.
   if (opt_index == null) opt_index = this.selected_frame;
+  if (opt_index < 0 || opt_index >= this.frameCount())
+    throw new Error('Illegal frame index.');
   return new FrameMirror(this.break_id, opt_index);
 };
 
 ExecutionState.prototype.cframesValue = function(opt_from_index, opt_to_index) {
   return %GetCFrames(this.break_id);
 };
 
 ExecutionState.prototype.setSelectedFrame = function(index) {
   var i = %ToNumber(index);
   if (i < 0 || i >= this.frameCount()) throw new Error('Illegal frame index.');
@@ skipping 1330 matching lines @@
     case 'string':
     case 'number':
       json = value;
       break
 
     default:
       json = null;
   }
   return json;
 }