[liveedit] reimplement frame restarting.

test/debugger/debug/es6/generators-debug-liveedit.js

 // Copyright 2014 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.
 
 
 var Debug = debug.Debug;
 var LiveEdit = Debug.LiveEdit;
 
 unique_id = 0;
 
@@ skipping 23 matching lines @@
 
 // First, try MakeGenerator with no perturbations.
 (function(){
   var generator = MakeGenerator();
   function callback() {};
   var iter = generator(callback);
   assertIteratorResult(undefined, false, iter.next());
   assertIteratorResult("Cat", true, iter.next());
 })();
 
+function ExecuteInDebugContext(f) {
+  var result;
+  var exception = null;
+  Debug.setListener(function(event) {
+    if (event == Debug.DebugEvent.Break) {
+      try {
+        result = f();
+      } catch (e) {
+        // Rethrow this exception later.
+        exception = e;
+      }
+    }
+  });
+  debugger;
+  Debug.setListener(null);
+  if (exception !== null) throw exception;
+  return result;
+}
+
 function patch(fun, from, to) {
   function debug() {
     var log = new Array();
     var script = Debug.findScript(fun);
     var pos = script.source.indexOf(from);
     try {
       LiveEdit.TestApi.ApplySingleChunkPatch(script, pos, from.length, to,
                                              log);
     } finally {
       print("Change log: " + JSON.stringify(log) + "\n");
     }
   }
-  %ExecuteInDebugContext(debug);
+  ExecuteInDebugContext(debug);
 }
 
 // Try to edit a MakeGenerator while it's running, then again while it's
 // stopped.
 (function(){
   var generator = MakeGenerator();
 
   var gen_patch_attempted = false;
   function attempt_gen_patch() {
     assertFalse(gen_patch_attempted);
@@ skipping 42 matching lines @@
     // Patching inside a generator activation may succeed.
     patch(fun_inside, "'Cat'", "'Koala'");
   }
   iter = generator(function() { return fun_inside(attempt_fun_patches) });
   assertEquals('Cat',
                fun_outside(function () {
                  assertIteratorResult('Koala', false, iter.next());
                  assertTrue(fun_patch_restarted);
                }));
 })();