[debugger] allow debug-evaluate to change stack and context values.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 649f1ee9878a44c06c0a286ad82908a792d95f78..85e7a438613bfb89d91f626a7eca2bc39626c2f4 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -800,6 +800,22 @@ Handle<Context> Factory::NewCatchContext(Handle<JSFunction> function,
   return context;
 }
 
+Handle<Context> Factory::NewDebugEvaluateContext(Handle<Context> previous,
+                                                 Handle<JSReceiver> extension,
+                                                 Handle<Context> wrapped,
+                                                 Handle<StringSet> whitelist) {
+  STATIC_ASSERT(Context::WHITE_LIST_INDEX == Context::MIN_CONTEXT_SLOTS + 1);
+  Handle<FixedArray> array = NewFixedArray(Context::MIN_CONTEXT_SLOTS + 2);
+  array->set_map_no_write_barrier(*debug_evaluate_context_map());
+  Handle<Context> c = Handle<Context>::cast(array);
+  c->set_closure(wrapped.is_null() ? previous->closure() : wrapped->closure());
+  c->set_previous(*previous);
+  c->set_native_context(previous->native_context());
+  if (!extension.is_null()) c->set(Context::EXTENSION_INDEX, *extension);
+  if (!wrapped.is_null()) c->set(Context::WRAPPED_CONTEXT_INDEX, *wrapped);
+  if (!whitelist.is_null()) c->set(Context::WHITE_LIST_INDEX, *whitelist);
+  return c;
+}
 
 Handle<Context> Factory::NewWithContext(Handle<JSFunction> function,
                                         Handle<Context> previous,