LiveEdit: implement frame dropping

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 456 matching lines @@
 Debug.disassemble = function(f) {
   if (!IS_FUNCTION(f)) throw new Error('Parameters have wrong types.');
   return %DebugDisassembleFunction(f);
 };
 
 Debug.disassembleConstructor = function(f) {
   if (!IS_FUNCTION(f)) throw new Error('Parameters have wrong types.');
   return %DebugDisassembleConstructor(f);
 };
 
+Debug.ExecuteInDebugContext = function(f, without_debugger) {
+  if (!IS_FUNCTION(f)) throw new Error('Parameters have wrong types.');
+  return %ExecuteInDebugContext(f, !!without_debugger);
+};
+
 Debug.sourcePosition = function(f) {
   if (!IS_FUNCTION(f)) throw new Error('Parameters have wrong types.');
   return %FunctionGetScriptSourcePosition(f);
 };
 
 
 Debug.findFunctionSourceLocation = function(func, opt_line, opt_column) {
   var script = %FunctionGetScript(func);
   var script_offset = %FunctionGetScriptSourcePosition(func);
   return script.locationFromLine(opt_line, opt_column, script_offset);
@@ skipping 1516 matching lines @@
           new_string, change_log);
     }
   }
 
   try {
     invocation();
   } catch (e) {
     if (e instanceof Debug.LiveEditChangeScript.Failure) {
       // Let's treat it as a "success" so that body with change_log will be
       // sent back. "change_log" will have "failure" field set.
-      change_log.push( { failure: true } );
+      change_log.push( { failure: true, message: e.toString() } ); 
     } else {
       throw e;
     }
   }
   response.body = {change_log: change_log};
 };
 
 
 // Check whether the previously processed command caused the VM to become
 // running.
@@ skipping 114 matching lines @@
     case 'string':
     case 'number':
       json = value;
       break
 
     default:
       json = null;
   }
   return json;
 }