Make Object.observe on the global object functional

src/objects.cc

 // Copyright 2012 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 1735 matching lines @@
 }
 
 
 void JSObject::EnqueueChangeRecord(Handle<JSObject> object,
                                    const char* type_str,
                                    Handle<String> name,
                                    Handle<Object> old_value) {
   Isolate* isolate = object->GetIsolate();
   HandleScope scope;
   Handle<String> type = isolate->factory()->LookupAsciiSymbol(type_str);
+  if (object->IsJSGlobalObject()) {
+    object = handle(JSGlobalObject::cast(*object)->global_receiver(), isolate);
+  }
   Handle<Object> args[] = { type, object, name, old_value };
   bool threw;
   Execution::Call(Handle<JSFunction>(isolate->observers_notify_change()),
                   Handle<Object>(isolate->heap()->undefined_value()),
                   old_value->IsTheHole() ? 3 : 4, args,
                   &threw);
   ASSERT(!threw);
 }
 
 
@@ skipping 12115 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal